3)  very rare empty boxes, etc. (1 - 3 known)
    shipping boxes (7,10,16,posters,reprint 1,3,4)
    wacky ads 5c box
    purple opc box (as on back cover of handbook edition 1) (2+)
4) irish empty box (5-10)
5)  1st, 1st cloth, 2nd, 6th blue, 11th-black empty box
    test-poster empty box
    patches shipping box
6)  3rd,4th,5th,6th yellow,8th,11th orange,15th,tattoo empty box
9)  9th, 12th, 13th empty box
10)  7th,10th,14th,16th empty box