WARNING!! I purchased two (2) sheets (20 stamps per sheet) last week at the post office; upon returning home I noticed that one sheet had four (4) stamps missing (and these are self-adhesive). The clerk did not put the sheets in an envelope (like they should have) but...there is no way stamps that are affixed with adhesive could drop off the sheet. Upon returning to post office this week, I was told by the Postmaster that I needed to let them know of this at time of purchase. So, another thing to worry about...don't forget to scrutinize your liberty stamps before leaving the premises! read full review »