If you haven't done so already, you need to pick up a copy of the Scott U.S. Specialized Catalogue so you can get a better sense of what you have. Given what I've seen so far, I think it would be a worthwhile investment. You can order the 2012 edition at the following link:
Haven't found any Zeps yet but there are other back of the book stamps including special delivery and postage due. A few souvenir sheets and exposition issues as well.
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