Created an auction at night and went to sleep, the next day, checked my auction when I was free and found the final bid to be 2 overpriced items and a third item which I've never seen before (Incinerated Barn Door Plank) valued at 1 key plus ref by scrap.tf. Well, literally lost a key plus for my painted cosmetic for an item which is only tradable but not saleable and buy orders are between 5 ref to 10 ref at backpack.tf and marketplace respectively.
Probably this suggestion will not be accepted but at least blacklist this item and items that have no value.
Just wanted to release some pent-up frustration. Sorry about that.