Posted By:
hankronYou might wish to remove the card from the holder, state that it was originally graded by PRO and is or is likely (if it is or is likely) trimmed ... If you want to offer it in a PRO holder and make clear PRO's history and reputation and what the bidder should expect to be receiving, that would be fine and ethical-- it's just that, on a purely personal viewpoint, I would rather sell a trimmed card raw than in a PRO holder.
All authenticity is is accurately describing an item. So if your seller's description expresses clearly to readers what is being offered, there is no problem.