Five years ago I sent several bitcoins to an old TradeHill account by mistake. This was after TradeHill went on temporary hiatus and had reopened as a high volume bitcoin investment group. At the time I immediately opened a helpdesk ticket with them, sent emails to all company members, and sent PMs on bitcointalk forums. I didn't receive any response from my attempts to contact them. Do I have any legal recourse in recovering my bitcoins?