Report from my previous research:
When I dug into Bernard's testimony a few years back, I found the claims of his death in the woods to be somewhat questionable.
I verified as 100% true his claims that the BIS's ~charter establishes it to be autonomous from the laws of any nation, meaning that no activity within it's walls are criminal. It logically follows that it could and therefore would facilitate acts that would be considered criminal in normal society. I verified a single exception to the aforementioned being that local traffic police can prosecute traffic infractions on the property's roadways.
I inferred that this may be the same for other central banks, but I did not verify this in the publications of any other central bank.