Hello,
(1) you can identify bone chips from this page of mine:
http://www.antiquegamblingchips.com/distinguish_iv_bon_cel.htm

(2) the bone you have pictured are nicer than most bone counters/chips. Nice trim. Not many people collect separate bone chips; they'd like a large complete, boxed set (about 200 pieces). Those who would bother with separate bone chips would pay about $4 to $9 (tops) for each of the pieces.

Robt.