He was using the screenshots from the account you are selling as 'proof' the wealth existed, screenshots that he didn't get on accident + you two have similair ip audits gives me reason to believe you are 1 and the same.
I was paying him when i noticed the screenshot was wierd and declined the trade just in time (2nd trade window).
So i kept my gp, yet this is probly not the first nor the last time he will try this.
First off these 2 sythe accounts are the same person proof here :
Screenshot - 58abc727e90317c29d6cf61b71c0ca54 - Gyazo
Screenshot - 70a8d7b6df561e126310363b53232f47 - Gyazo
This is the acc he was selling : Screenshot - aaed70c9001be5021d38e171c0288a00 - Gyazo
Which is the same account he used...