at dynadot you can opt for transfer prohibited and sleep well. still, whoever got your domains probably did not had a chance with all the protection and securities there are.
Would I be right in thinking that in the USA you have such an offence
as "possession or handling of stolen goods" ?. Since I believe domains
have been ruled to be Property perhaps the new registrar is guilty of
possession or handling of stolen goods , particularly once he knows
they are claimed to be stolen ?.
DG