<prompt> Human: I recently moved across the country US after living in the same apartment for 10 years. 3 months after moving, my former property management company sent me a check for 1k, with no letter attached, just a notation that says tenant refund.I didnt think I had a security deposit or anything, but given that I moved in 10 years ago its entirely possible I did give one and just dont remember.I sent them an e-mail Thursday just asking what the check was for. No response yet.So how far does my responsibility to investigate this go? Given that Im not sure either way, what do I have to do before I can just deposit the check and not worry about it?  <response>: I would feel comfortable assuming its your security deposit. Cash it and go about your business. 