The Correct Etiquette for Dealing With a Bio Hazardous Smell

Our neighbours hadn't told us this has happened, and we left without mentioning the gifts left behind. What is the correct etiquette for this situation? Do we tell them their son likely has a problem due to the bio hazardous smell he left? Or do we simply ignore it, knowing they must have known as well? Many thanks for all the laughs. Anonymous. If I see an email now or a letter that has the word poo in it or a derivation of or a synonym, it's not being read. Vic Hope: "I think Ben's in a really good mood to deal with my strobeast today" Jordan Will: "He paid good money to go... then