This article is from the Toys FAQ, by firstname.lastname@example.org (Scott Gordon) with numerous contributions by others.
If all available means have been taken to ensure that the person
you are dealing with has not made an honest mistake, and it has
been determined, if possible, that the package is not still in
transit or lost by the mail facility, it is then appreciated and
highly appropriate to warn readers that certain persons should not
be dealt with. You could save someone else the aggravation and
loss of money that may result in dealing with this person, but it
is important to first take all measures to ensure that you are not
wrongly ruining a person's reputation by reacting hastily.