One wonders how this would have shook out if the guy had stored rat poison in the urn instead of, possibly in addition to, dads ashes.

I think this points out that while there are professional burglary crews who know about all the tricks the majority of burglars are not-to-smart amateurs who are far less likely to see through intricacies and complications, like urns kept of mantelpieces generally not being filled with drugs.

Most career criminals are not Lex Luther level geniuses.