Mobbs
A Large Portion, Yes
Ohhh! Understand now. There's a dump chest which is the last or 2nd last one from memory.Your supermarket has 4 sides, 10 chests on each. But of course you'd have a dump chest for uncommon stuff.
No it's actually a lot less than 40. A number of those chests are not rigged up at all. It's probably more like 27 or 28 that are operational.