We always take something that seems fitting to the place we are or what someone that may be with us might want.
We always leave at least one or more items of same value or more. We keep a container of items in nap sack and leave a couple items that we think might be needed by someone finding cache and something interesting. most items are $2.00 to $4.00 in value.
I've never seen anything of greater value in a cache. We are new to this thought. Who knows we just might find a gold bar someday.