What proof exactly are u expecting? A screenshot of him waving his ID to the camera while doing the chargeback on paypal? A screenshot of him taking the money away from someone's pocket caught red-handed in real?
I am sure if i showed u one of those screenshots u would either say any1 can have the same name or any1 can have the same face so this is not enough to call some1 a scammer. This is beyond dumb if u ask me.