I smell a rat with this story. PHX - did you happen to note the type of aircraft? It's a 767-300. The 767 does not have an individual tank under each toilet. It has a vacuum system, so one tank in the back of the aircraft, that is not under any toilet. Also there is a valve that closes when the toilet is done being flushed. So, unless each toilet had a load of waste in each one that was not flushed down, you cannot smell the contents of the tank.
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