Just a suggestion:
Save them.

1. if a current bag has a issue, you have a back up and it won't stop your surfing while your waiting for a new one
2. If you need weight up front because of a small crew, buy a tsunami pump and fill it how much ever you want in the center front floor area (I do that with a 500lb)
3. If you sell your boat, pull the upgrade rears and put the stock back in
4. Pull your new mid-ships and put your 1000's in there (What I did)

OR just sell

Just some thoughts