I really appreciate your thoughtfulness in sending along the case and arm band you advertised when you sold me three refurbished 1GB MP3 players, which I bought mostly because they were cheaper than 1GB jump drives. You immediately owned up to your mistake, sent an e-mail to everybody who bought one, and then shipped out secondary boxes of the arm bands and cases. Great!
But next time, can you make sure you send along a case actually designed for the product you just sold me, instead of one with an almost completely unrelated form factor? Spending a minute or so just visually comparing the two should have been your first clue.
Lots of love,