Maybe I am being a bit harsh in saying this but I don't buy into the emails not being received thing. If I am selling something then I KNOW what I have on auction therefore I would be checking it to see whats happening.
As for something bad happening, well in this particular instance I have seen other people have received their items as I had been watching their feedback.
Should the seller contact me and let me know something had happened or they had somehow "forgotten" they had this item for sale then I will very happily retract my feedback.

I have left neutral feedback before when a doll I received had a broken arm as the seller had not packed it properly/protectively but she offered a refund and pay for the postage but MIL still wanted the doll and wanted to take it to a doll hospital.

I dunno maybe I expect too much