By the way you missed the important bit from that other thread:
Paypal will not reveal details on someone else's account, but you can talk to them about your account. State that the account owner for firstname.lastname@example.org has informed you they can not access the account in a dispute and escalate it. As we can't login to the account to respond, paypal should by default rule in your favour and refund any money that still did somehow get through.
Sadly this is all I can offer with regard to refunds given the problems with accessing the account. The generosity IS appreciated, but as we couldn't access the funds I was uneasy about posting public recogonitions of any claimed donations.
I hope you did this at the time, because it would be far too late unfortunately to do anything now.