Hello Auntsvase,
Maybe I'm on my own, but why do you need a value? For insurance I would understand.
I keep many things, for a number of reasons, but the most precious to me are those that have a sentimental value. So, I protect items accordingly. Most things are out in the open on shelves, on the mantle shelf, sideboard, etc., but anything particularly prescious, or fragile, is in a display cabinet.
Nigel