According to USPS, my order was delivered today. Except I didn't get any mail today, let alone a package from Threadless. My mail carrier put my neighbor's mail in my box and god knows what happened to mine, because it wasn't a simple mix-up. That particular neighbor didn't get any mail at all, as I learned when I walked down to give them the mail that was put in my box. Another neighbor got someone else's mail and never got her own.
So, apparently someone else in my neighborhood has my Threadless tees. I've already lodged a complaint with the post office, but if I don't get that package by the end of the week, there will be hell to pay.