I bought a bra from ebay recently, which was exactly as described, exactly what I wanted, but stank of cigarette smoke. I emailed the seller to say it had arrived (I always do this) and mentioned the smell - but made it clear I was only doing it for her info, as I knew the smell would come out in the wash. I left positive feedback, as overall I was really pleased - it had arrived really quickly as well as being exactly what I wanted. The seller actually gave me a £4 refund (on a £13 bra), which I was really pleased and surprised about. So for me, it was worth mentioning, although the only motive I had was to let her know.