1. We're not talking about hitting fort nox here. You could easily just go after the gold at one of those very brokerage shops. Or, maybe you could hit the mint. They do use the official mints to strike specialty collectors coins, and they also use them to strike the 1 ounce gold coins distributed to paid collectors.
Or, you could even hit one of the temporary holding locations for the gold in transit between the large repositories and the mint.
2. You just solved the very problem you were yipping about with the gold when you were talking about your solution on the Mona Lisa. All you have to do is wait. With gold, you even have an added benefit. You can store it a lot more roughly. You can even burry it in the dirt. You can't put the Mona Lisa in the dirt, it would be destroyed by such an action.
You should seriously look into what goes into art preservation. Just holding an old painting like the Mona Lisa in conditions that are too hot or too humid can cause the paints to begin running, and you also need to keep it from getting crushed or scraped. You also would have to worry about bugs or rats getting into wherever you are storing it. There are way too many things that could go wrong very easily in the years it would take for you to wait for the heat to die down.
You don't have to worry so much with the gold. The only concern you would have with the gold is somebody else finding your hiding spot, but then you'd have the exact same concern with the Mona Lisa.
3. As I detailed in #1, there are fairly low-profile ways to steal a gold ingot. These methods could even go without it being widely reported at all. Nothing is going to stop them from suspecting theft with an item valued at nearly a million US dollars going missing, but if anything they will suspect one of the employees and launch an investigation into them long before they ever start looking outside their organization, and it would never go up on the news at any point.
As for the Mona Lisa, there is absolutely nothing that could prevent that from becoming high-profile and discussed on every social media blog the entire world over. You would have a lot more than just the local police and local federal enforcement agencies looking into it, you would have literally everyone in the entire world spouting theories. Also, there is a chance you might accidentally mobilize a crew of internet theorists. If you get those guys motivated, they can literally figure out ANYTHING.
(There was a rather famous case in the US shortly after Trump was elected. There was this guy who hung a flag that said "He Will Not Divide Us" waving up in some secret location. 4-Chan found the location within 24 hours based on road sounds and airplane con-trails that were visible and audible on the feed. An internet group can literally be better at figuring things out than the world's best supercomputers if you get them motivated enough.)
I know about art preservation, that’s the entire reason the Mona Lisa is sealed away in a climate controlled thick bullet proof glass box, both for protection and conservation through control of humidity, temperature, lighting and whatnot. As for rats and bugs, where I’d store it, there’s no need to worry about them either. People stumbling across it, there’s no need to worry about that in the designated location. It just so happens I have the ideal conditions to store it which is why I’d say to sit on it for a few years if really necessary.
But you honestly don’t even need to wait a few years anyway, a high reward would obviously be put out soon after it disappears for the sole reason you’re listing anyway. They themselves know better than anyone else it will degrade quickly so with the insurance money they can claim on it, the reward put out would be a juicy one for whoever finds it or leads to its discovery.
Effectively, you have it taken an this high profile artwork hostage, if they piss you off, you could burn the damn thing for all they know. You simply need to store it where you’ll inevitably tip off authorities where you saw a suspicious person headed in a certain direction with what appeared to be a rolled up parchment who when you asked about it they were evasive and it made you suspicious. Even a stupid tip like that would eventually be looked into. The reward will inevitably end up in your hands.
There would never be any evidence connecting you to it either. However, you could plant fake evidence as the simple act of there being no evidence would be strange. With it carefully wrapped up, you will plant another person’s finger prints all over the material you wrap it in when time was still frozen. Make it a pretty high up employee who works there of course.
You’ll be able to assert your innocence in such a fashion, get the fat juicy reward and fame, and throw everyone into disarray and confusion as to how that person was the perpetrator or accomplice. Who’s ever going to think time was frozen when some random nobody stole it? They’ll be laughed to death if they said that with a serious face. It’d be too absurd to believe. Someone in a far away country was never detected or seen in the country or any counties nearby even once.
Regarding internet sleuths finding you, how are they going to find someone that has no internet footprint related to their real identity with literally no evidence left behind at the scene of the crime when it initially disappears? By the time time resumes, it’s already safely hidden away. They can literally do nothing.
As for the gold, even if you wait years, the second you dig it up and start distributing it as gold beads, the problem with your plan still remains that some random approaching multiple people to sell them off in small quantities if detected can be traced back to you.
But either way though, neither your plan nor mine would likely work in the end since these items are just going to be destroyed and atomized once time resumes because of the insane acceleration they experienced to bring them up to the speed of light while time was frozen. The simple act of touching them and picking them up accelerates them to the speed of light. Even if your body ignores it, it doesn’t mean these objects ignore it. Once you put it down and time resumes for them, they’re going to poof from experiencing a near infinite force from their initial reference frame in time. So as for you storing gold in the ground, good luck with that when it explodes and causes a scene after time resumes. Those gold particles will then float away into the atmosphere. Same for the Mona Lisa or anything anyone else wants to steal.
If you try to store it somewhere under pressure to prevent the gold particles from escaping, the container you’re trying to store it in is just going to explode. It all ends up being pointless.
The only way to truly steal anything of value without it being destroyed would be acquiring something like passwords and login credentials or information like trade secrets for corporations/confidential information written down by sneaking into some high profile people’s places and trying to find if they have it written down somewhere. You could sell those login credentials or the information you acquired to the right people, and that’d honestly be your best bet of making any real money. Information is the most valuable thing you can actually acquire while time is frozen, not anything material.
Lol imagine a series where this is the premise. The best thief in the world but they keep failing in the end because the stuff they steal always explodes. In the end they realize they can only steal information. Time just randomly freezes for them for 24 hours every now and then and they become the best worst phantom thief in the world.