You all were talking about how to save stamps that were not marked, i didnt see this thread till today so if you guys still dont know how to save those I will tell you.
I used to collect so I read alot about to get them off the envelope.
When you get something back and the stamp is not used cut the stamp off of the envelpe, leave about 1/4 in around it, then after you have it cut off put it in some water, let it set in the water for about 5 mins, dont put it stamp side down, put the paper sod down, after it had sat in the water for a while the paper from the envelope shoud come off, if it doesn't come off easy out it back in the water got a little longer.
After you have gotten the paper off the back, put in on a towel and fold one side of the towel over the stamp and put a book or something on top, then let it dry.
All you have to do id glue it on the next envelope you send out.
Hope that helped some.
Duct tape is like the force. It has a light side, a dark side, and it holds the world together."