Not every CAP aircraft goes up for sale here. I know of a couple of wrecked gliders since 2008 that I would have bid on to repair, but they quietly disappeared and were reregistered to a new owner, so a sale or other transfer did take place...
Depending on how CAP acquired the glider in the first place may determine how they get rid of it.
It could be: 1. Brought directly by CAP Inc., 2. Government Surplus - i.e. AF Academy Gliders, 3. Donation.
And how they are deposed of differs for each one.