If they were not listed as Good Til Cancelled, look in your Unsold Items list. They should sit there for 90 days.
FWIW, I keep all my descriptions in a text file on my desktop. Although most of my books are nearly unique, there are some that I find, post and sell over and over (Roberts Rules of Order is popular in the former USSR, for some reason, and Red Dwarf- Infinity Welcomes Careful Drivers is a good mover.) Having the basic description means I only have to change the publisher and the scan when a new copy is needed.