Yesterday 10 of my auctions sold. All but 3 bidders paid last night. Today I went to ship out all the items that had been paid for and accidentally packaged and shipped one of the items that had not been paid for yet. The buyer has 100% feedback so I hope it'll be fine, but in the event they receive the item before they pay (I shipped Priority), what do I do? Do I just have to prove to PayPal that it was delivered with a tracking number? I can't believe I did this!!! I'm normally so careful, but I've never had 10 items sell on the same day before.