Originally Posted by WillCAD

I would expect certain types of containers - the more obvious urns - to be easily recognizable just from their many appearances in movies and TV shows. A sealed urn with a lid, particularly if it has the deceased person's name emblazoned on it, should be pretty darned obvious even to a TSO.

Unless it's labeled "human remains", I probably wouldn't recognize the cardboard box as a cremains receptacle, either.