[quote name='alonzomourning23']Why do people care if it's illegal to use them for other things? My father uses them for shipping, and I took a ton of them when I was moving. The police aren't going to be banging on your door just because you didn't use them to ship stuff.[/quote]
Because the USPS supplies them, for free, for *their* customers.
If I ran a McDonald's, and I didnt' want to buy any napkins, is it right for me to go next door to Burger King, take--not buy, take--10000 napkins from them and use in my business?
If you take these boxes, and don't use them [eventually] for USPS shipping, you have lost all right you may have had to bitch about USPS service or costs. About two years ago I ordered a case of each kind of box, and I'm still working my way through them. But I'm using them for USPS shipping.
Certain people thing certain things are wrong, regardless of if you're going to get caught. It's simply a higher stage of moral development.