Thanks much for the reply, Jamie!
If I can get more info from my friend about her vases, I'll post on here if anyone's interested.

Originally I had planned on filling them with cocoa or other drink mixes, but without solid lids, will probably have to resort to other items - my cousin likes to make jewelry, so I could fill one with stuff like beading wire, beads, etc; or candy seems like a good last resort!
Thanks again!