Nazi train full of gold in a hill, perhaps?
That is the so called theory; nothing was uncovered. Interpol just stood in as an International Verification to ensure that ALL Parties got what legally they earned.
My opinion, chances are Poland will allow it to run through the courts process just long enough to declare the area Historical Property through some sort of past event that took place there; and then all that is suspected will be forfeited to Poland.
Seen this twice in Germany with an American, once in Spain and countless times in Sweden and also in Norway.
Finding a couple million is nothing really, but find some major history with a current value of say 20 million, then you can count on 2 things. First thing is that you will get screwed in Europe and second thing you will be treated like crap and the Federal Historical Ministry will often try to discredit you and press charges.
I saw one American US Soldier who found some really good finds in Germany be treated very badly for this. He did not break any laws at all, he GPS recorded his finds and turned them in right away to the government. I was sent there to watch over the process when the American took the Fed Team out to the site. The Senior Arch for Germany was doing nothing but bad mouthing Americans to me and acting like he was on his high horse until I explained to him that I am an American, he could either address me as Agent or Dr and that I would be filing a report with State & Federal German police on his Nationalistic and Racist views clouding his poorly educated professional opinion.
The a couple minutes later he started running his mouth to a Local German Cop that called me over and told me what he said and then I threatened to drag him out of the forest in cuffs and lock him up for 60 days where I would then file an extension for another 60 days without council because I am too busy to interview him and in the mean time we would have local authorities search his properties and work place and chances are very nasty things would get leaked about him and his wife and kids would catch the bad end socially for it all while he is locked up.
Then I told him the worst part about Americans is we will tell you to your face exactly what we are going to do to you, how it will play out and make sure your country is there to support us as well. That German cop he was talking with was nearly in tears laughing his a** off.
Then the German cop told me a story him self about a local national girl whose father is a cop and she had found 19 kilograms in gold and that the Fed Arch's took it away from her and treated that entire family like crap for it. He said after that German Police got to see the real truth behind the Fed Arch's and they do as little as they can to support them.
But yeah, chances are they will get screwed out of that in Poland. Thats Europe for you, trying so hard to be like the US but still screwing everyone they can in the process so that who ever got over in life can retire in the US.