I haven't seen this one before. Buyer's address on ebay is
john doe
123 main street
acme supermarkets
pittsburgh PA (zip code)
My understanding is the company name has to be the 2nd line in the address if there is one, same with an apartment number or suite or whatever. 3rd line is the street address, followed by the city/state/zip.
I use pirateship, the company name didn't import into their system so I didn't ship it C/O acme supermarkets. It was delivered there last week but they never got it to the buyer and returned it to me by USPS yesterday.
HTH do I handle this?