Store them in 4x6 photo boxes, then store the main case on end so the stamp spots are stored upside down, labeled by color. They stay "fresh" longer because they are triple sealed - their lid, the 4x6 box, and the case.
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April 01, 2017
January 11, 2017
February 14, 2016
October 13, 2015
October 13, 2015
October 12, 2015