It's kind of hard to like anyone in the story, really, even though their aunt and uncle are clearly the "good guys" and the only honorable people besides the lawyer, shockingly.  It's not inconclusive - they could have searched for 88 years, but would never find a stamp that's been sent to the dead letter office, and I think the ending is fitting for two such POS guys.  It is divine retribution.  Once again, Russell Horton and Lloyd Battista have wonderful chemistry in an episode.c