If it is lost in the mail then absolutely B.S. for leaving negative. I have a package from Ebay that has been lost in the postal system for 18 days now only going to MN. The guy is threatening negative feedback and blah blah. I provided him with a delivery confirmation # and answered every email within a couple hours.
This is not what this seller has done apparently and any joker can say it was lost in the mail but without a delivery confirmation # or tracking of some kind its impossible to prove.

This is a rough case. I do agree that its completely irrelevant what you look like to your buddies.