What is the ruling on eating what was seized from a Japanese ship whose contents of fish and canned goods were confiscated? Is charity from it permissible? And what is the expiation for that if it was unlawful?

Purchasing confiscated goods and dealing with their sources through gifts or similar means is not permissible. If it is possible to return them or their value to their owners, that is the obligatory course of action. Otherwise, they should be given as charity to the poor and needy.