So... you don't have even the date or the amount? I'm kinda puzzled now as to how you could dig up chats with random people from months ago within minutes, but not have the amount of a trade from ~ a week ago, which was presumably negotiated via some form of digital communication... or was it a skype voice call? ... or did alia just say "send me any amount, doesn't matter because I'm a scammer and will reverse the PP payment anyway"?

I'm not convinced you're taking taking this seriously but you probably should.