Yep, noticed it on Ave M as well, bad look for us, almost definitely against their contract, and doesn't make sense as they do get about a $1 -negotiable based on volume, ground/air, etc
Unless they taped it up for you and helped out, that would be the legal (UPS wise) way to charge you, and probably the reason why they charge it, is bec of too many "Mrs Blanks" coming in 3x week with amazon and zappos, always open packages asking about return policy for 30 minutes, making you tape it up, wasting everyone's time, and not spending any money
But ya if it is a real drop off, as in just drop off should not pay