Andy,
the gentleman who traded me these dice, told me he believes not more than 10-15, because he originally heard there were a total or 4-5 sticks, and then they were broken up into pairs of two. if there were 4 sticks, @ 5 dice per stick, that would be 20 dice or 10 sets of 2.
I can't say who the guy was that traded me these dice for my chips, but he WAS a high ranking person at the rock, just a short while ago.