The biggest haul I ever had filled up the trunk of my car (which is huge) and the back seat (left quite a bit behind). I have been collecting mac since 2001 or so and would still jump at the chance to find a local stash like that as long as I didn't have to take it all or nothing.

Depending on where you are in the hobby (beginner to advanced collector or maybe reseller) you would have taken it all or just what you need. It is hard for some people to not snag everything, and then you have the problem or storing, sorting, cleaning, and testing it all. You never know what could be in all those boxes and you don't have all day to poke around and find out.