Comment by jacquesm
Yes, but they are now aiming to use these funds to buy real estate and of course that is going to raise a bunch of flags. If the government would accept this without challenge criminals would suddenly be left all kinds of crazy inheritances. At a minimum you'd expect some documentation of how that money landed in their possession in the first place, for instance a will, a final balance of an estate and so on.
I've handled a couple of these for family members and the amount of paperwork around even a minor inheritance can be pretty impressive.
I'd expect a presumption of innocence, and at the very least I'd expect some documentation from the government showing probable cause of a specific crime the money was involved in before blocking the transaction. The presumptive innocent party shouldn't have to provide anything by default.