What if they're being stored at a business?
I'd like to know as well. I started doing an inventory of my stuff at work, and stopped around $20k (at retail) in tools and my box, and I've still got a few sets and many individual items to add.
My boss said his coverage covers anything that isn't "small tools" which they define as being under $1k per piece. IOW, everything I own.
what if you live in a rental home? part of renter's coverage or is it a separate thing?
Probably, with a strong "but"... like thumper 68 said above, there's usually a limit on $ value of categories. For example, I had a couple guns stolen years back, and had a $25k renter's policy. Surprise, it had a $1200 limit on guns, which covered roughly the more expensive of the 2 that got taken.
I now have a non-renter's policy on my wife's camera stuff. It covers basically any incident short of losing it on purpose, and I'm paying about $50 a year for like $6k of coverage.