Seacard, I haven't checked the statute of limitations or the general rules for laches on these - it would be complex. But many statutes of limitations will run for several years, so it is worth looking into.
As for getting blood from a stone, I agree. However, no one really knows how many assets Mikhail has. It is possible to seize personal property, garnish accounts and force sales of real property. Those cannot be answered here, however, that absolutely does not mean those avenues shouldn't be explored.
In one case I worked on, we used a default to send a sherrif and a few agents over to the person's house and we seized everything in the guy's house. Furniture, appliances, everything. I can't say for certain if that culd happen here, but, again, it would be worth exploring that option. It could force the return of any number of amps. If Mikhail is holding a horde of gear, it could be returnd or sold by a receiver to satisfy people.
This cannot be answered here, but people who are owed money and/or gear might get something instead of nothing. Further, it would be a measure of justice.