Not sure how far along in the transaction menu you are (accepted/pachage sent/package received) so I don't know where the cards are in your collection (collection/trade/in-transaction/in-transit). At the bottom of your collection page it has the following actions listed below. Would any of those help?
changing the status to "Accepted" will change the status of the items in your collection to "In-Transaction".... could you use the action below "Move this whole In-Transaction list to your collection..."
Actions
• Move this whole collection to your For Sale / Trade list...
• Move all duplicates in this whole collection to your For Sale / Trade list...
• Move this whole For Sale / Trade list to your collection...
• Move this whole In-Transaction list to your collection...
• Move this whole In-Transaction list to your Wantlist...
• Move this whole In-Transit list to your collection...
• Move this whole In-Transit list to your For Sale / Trade list...
• Move everything into another collection...
• Delete your whole Collection...
• Delete your whole For Sale / Trade list...
• Delete everything that is currently In-Transaction...
• Delete everything that is currently In-Transit...
• Select a random card from this collection
• Select a random card from this for sale / trade list
I like sportz and I don't care who knows!