I used to do that but my local post office gives you a hard time about taking flat rate boxes. They say if "Hey of you aren't using that to mail something out you can't take them"
I say "Yeah eventually"
They say "Well that's not what it is for...if your not mailing something today or tomorrow you shouldn't take them"
I think this is another case of a few people ruining it for everyone else. People grabbing an armful of flat rate boxes for moving or organizing thier junk.
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