Its a judgement call for sure. We all know you could adapt a 1/4" ratchet up to some large size and break it in seconds. Who knows what the original guy did exactly. I'd imagine the tool route men have formed an opinion about the guy's working habits. They know the guys who use tools properly and guys who expect warranty coverage on misused stuff.
Both manufacturers have a clause in their warranty against misused tools...
http://www1.snapon.com/display/termsofsale.nws
http://www.matcotools.com/CustomerCare/warranty.jsp
In my opinion, unless I was a real heavy hitter with my purchase volume on the man's truck, I'd expect a warranty in this case, but I'd imagine he'd be a bit more hesitant the next time.
I stand corrected, seems like they can pretty much get out of any claim with ambiguitous language such as Abnormal, unreasonable, misuse, and overloaded...maybe he deserves one replacement and gets stuck with the other two...
"Abnormal use" includes
misuse, accident, modification,
unreasonable use, abuse, neglect, lack of maintenance, use in product-related service, or use after the product is significantly worn. Abnormal use of tool storage units also includes, without limitation, situations when a unit is pulled using a mechanical vehicle, rolled over large drops, used in a highly corrosive environment, used as a step stool, modified with non-Snap-on parts,
overloaded or modified in any way.
seems like they can pretty much get out of any claim with ambiguitous language such as unreasonable misuse, and overloaded...