The other day, I used the large APO flat rate box to ship some heavy items. She asked me where I got the box from, which I told her that I either got it at her post office or at another post office nearby, but I could not remember exactly. She asked me to wait, b/c she was going to ask her supervisor whether I can use that box. Then she came back and said that they'll let me use it this time for international, but that it is supposed to only be used for domestic, for shipping to APO's. I told her that I am shipping to an APO. Then she got really embarassed and said, "oh, sorry." Anyway, I was pissed for a whole day after that, but I am over it now. 