I recently sold multiple books on eBay to one person and shipped them with UPS. Although I shipped two packages to the same person I was only given 1 tracking number which doesn't seem to work. The tracking number is mostly letters starting with MM and won't work for UPS, USPS, Iship, FedEx or anything. The person is very angry and suspicious even tho I have sent them photos of the receipt. They're threatening to open a paypal case and I want to know if a copy of my receipt is proof enough? The receipt doesn't show where the package was shipped or how many packages but it does show the day which aligns with when the package was marked as shipped on EBay. Edit: package arrived, no case was opened.
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