IF you're not going to let everyone know who the vendor was? I know some people can just come and say anyone scammed them, even competitors, but at the same time I see no reason to mention if you're not trying to prevent others from being scammed, or at the very least let others vouch for the specific vendor so you have an idea if they are selective, or if maybe the package was lost, seized, etc.
I guess a part of it is not wanting to go around bad-mouthing someone - who's already proven themselves to have no morals - who has your name and address.