So what do you in this situation? I sold two laptops the same day and I got the shipping labels mixed up. I was informed by the fist customer that the item was wrong and realizing what I had done, asked if he could forward it to the second buyer. "No problem!" The problem was the second buyer got the better laptop at a greatly reduced price and would not reply to any attempt by me to contact him. In the mean time he receives the laptop sent from the first customer. This guy must have thought he won the lottery because now he has two laptops!
After several voice messages and e-mails he still won't answer me! And get this! I get a negative feedback from this guy that I'm a scammer and have been harrasing him! When I contacted EBay for help in the matter, they said: "the problem was outside of EBay policies" and could not help.
Bottom line is yeah I messed up! But if it happens again, they're just going to have to wait the extra time. "MOST" people realize accidents happen. Not All!