I just came back from the store where I returned my last 2 iPhones. Fortunately, the same associate was working at the time and made things a little easier for me. She remembered me and obviously knows the phones were fine. She said she never entered the condition as damaged because otherwise the system would never let her accept the phone and that the receipt I got stating the lease was closed was proof and that I should hold onto it forever just in case. I'm guessing it's a bug and going to say "damaged" for everyone doing a return.
Anyway, she called up internal customer care to ask about the $81 ($27 x 3 phones) charge for the phones I just returned and the guy on the line promptly added an adjustment for this amount. However, he said the charge was scheduled to be dropped 3 days before the bill was due (I don't buy it), but since we had him on the phone he made the adjustment immediately and put a stop on the scheduled one. I checked my account again after we hung up and noticed he didn't drop the taxes on the $81 but at this point I'm just going to accept it and move on.
By the way, I didn't get credit for the higher memory variant upgrade either even though I preordered on 9/12. I guess I'll call them up later in the week about that.