if i were to have a mail drop scheduled for a place that i wasn't planning on staying, let's just say the blueberry patch since i can't stay there b/c of my dog, would they charge for holding? it doesn't state a fee in the a.t. guide, but is it normal for places to charge hiking non-guests for mail drops? or if not, is it considered rude not to "donate" when i pick up my package? what's a general amount?