The seller contacted me to say the flooring nailer they represented as new in open box with the mallet in fact did not have the mallet. Without the mallet the nailer doesn't work.
The seller offered to ship the nailer without the missing item or I could have a refund. After that the seller went silent, did not respond to two requests for updates. I had to institute a refund claim with eBay.
How did the seller know to represent the condition and the content of the items for sale?