Pictures of the cards with your forum name and date on. Or your’re just another scammer trying it on with your “verified twitter”
![Roll Eyes](https://bitcointalk.org/Smileys/default/rolleyes.gif)
since when proof of ownership clear the intentions of scamming ?
![Cheesy](https://bitcointalk.org/Smileys/default/cheesy.gif)
Since never, but at least, it proves that the seller has the items in hand so is a good step in the right direction.
Offcourse, escrow is mandatory, but why waste time with a seller that can't even prove that he owns the items that he is trying to sell?