Have you been issued a tracking / waybill number by the seller? Have you tried calling UPS yourself?
I have experience of one eBay parcel shipped by Royal Mail disappear . Once overdue, I tried contacting the seller and asked him the way bill number. A couple calls later, parcel turns out to have been misdirected to Taiwan. Took a month to receive. Seller didn't help much, I had to make all calls myself.
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