"loaded xbow" is right at the edge, as far as I'm concerned. Personally, this is probably a classic "if you hadn't asked" moment.
As for the others...
"box of dominoes"? "Bag of gold pieces"?
Contained in the box or bag, fine. You're really just storing the box/bag, and the dominoes/gp come along for the ride.
"Stack of paper" (as opposed to "book")?
Bound, fine. Loose, problem.
"One meal's worth of dry rations"? "Calligraphy kit"? "Disguise kit"?
Assuming bound together in a sack or box, fine. As separate items, problem.
Closed, fine. Open, not fine. Considering the standard quiver doesn't over covering/closing flaps, not fine.
Not fine. Unless, maybe, you tie them together.
"Charm bracelet full of charms"?
Fine. You're storing a single item, just like a pearl necklace is also safe.
Basic rule: anything you can pick up in a single hand without worrying about it coming apart is safe. Also, if you use the word "and" in describing the item ("scabbard AND sword", as opposed to "sheathed sword") it's probably not safe.