eBay

So about a week about i shipped a collectable to an address the buyer has on file. I gave tracking. Today I checked and the tracking says "no such number" I'm assuming usps will send it back to me. I contacted the buyer about it and he wants a refund...

So roughly a month ago I made a purchase. Some days later the seller shipped using some weird tracking "ESUS" now weeks later tracking says it was delivered, but I never received. All it says is delivered and under that just my zip code. Nothing else...