I had received ~$200 from friends to start a video game project. They froze my account. I did everything they said to do to get it unfrozen: sent photocopies of my ID, etc. Still frozen. No human interaction.
Two years later I get a letter from the state comptroller saying that PayPal had been trying to reach me to give me my money back, and if I wanted it to call a certain 800 number (of PayPal's, not the state), otherwise it would revert to the state. I called the number and they asked me, "Do you want to be mailed a check, or can we just credit your PayPal account?" Since the account was still frozen (as far as I know, I haven't tried to log in to it in years) I said send me the check.
That was the last I ever heard about it.
No check was forthcoming.