Oh this happened to me in reverse. My workplace (a client's office, technically) dumped a bunch of stuff at my house without permission, and I did not keep it. Expected me to store boxes and boxes of financial records, for infinity years, no contract or anything. They also defaulted on money owed to me, which I had to pay taxes on, even though I received nothing. Never have I met such an arrogantly entitled company owner.

Sold it all as scrap paper. Recovered 0.005% of the money owed this way. Later their company was dissolved due to nonpayment of taxes. If they ever come back to the country, they may have heir passport withheld until they pay what's owed. Which is whatever the tax department says it is, because they have no financial records.