And if you used 3rd party or custodial service back in 2009/2010, AFAIK almost all of them no longer exist.
He is not the first to claim that in 2009 or 2010 he suddenly decided to buy BTC, then he paid with PP and then after xx years he remembered that he had some kind of wealth that he obviously could not access. I remember a story that I read here on the forum about a character who claimed something similar, and he bought BTC from some person who offered it to him in the park...
The OP may have something, but there is also a great possibility that there is nothing - and the fact that he does not want to accept any advice or give more information certainly points to the latter.