Not one pill crusher, but 5.
without sounding judgemental, I would say most likely it would be something to do with drugs. He may however not be an addict, he could be a dealer/drug manufacturer. What else would he need five for?
One pill crusher...no. But five?...yes the thought might enter my mind.
I would think it is a bit odd he is buying 5 pill crushers. Most people buy 1 or 2 only.
I use pill crushers to feed my dogs crushed pills mixed in with peanut butter. I wouldn't assume anything. Maybe yes, maybe no.