Does anybody know how exactly the Post Office measures a Box? They told me the Box cannot exceed a 108" or else I have to pay a over size Box fee . The 1st Post Office employee told me the Box was 3" too big the 1st time I took it in. I brought it home and reduced it quite a bit. I took it back again it was a different employee and she told me it was still too big but we're not tell me how much.. I reduced the Box again and today I asked my post man if he could please measure it in let me know if it is under the size.. He told me it is still too big and I would have to pay over size for you but would not tell me exactly how they come up with a number.. I have never had this problem before. Can someone help??