Proof Set Question For Resale.

We need to know what you are talking about

For post 1999 set the holders can be opened and closed without damage so swapping the coins to an undamaged OGP holder would be best. You can possibly find empty holders being sold on ebay or put ads on forum marketplaces looking to buy same. There are probably members breaking up sets that would sell the holders. That would probably be cheaper than buying aftermarket holders.

For the pre 1999 sets that isn't a possibility as those sets were sealed and the holders are typically damaged, sometimes severely, in trying to open them. In that case either go with an aftermarket holder, or put them in a post 1999 holder, which in my opinion looks better, and I believe some of the sets don't have the year shown on the holder.

Here are the best pics I could muster.
The scratches look worser under the scope.