This is a common scam (at least in Europe) usually carried out by callcentres from India (or at least they have the accent and operate from whereever over VOIP). Haven't heared about any arrests but there have been multiple articles published in the media to warn the public.
Useless to say, this fails at some part of the population

$25 seems pretty low, considering somebody will have to fetch hundreds? thousands? of these money orders.