James;
I'm a used to be coin collector.Some coins, as with some chips,can "far" excede their face value.If I were you,i'd take the time,buy a book and check each and every one. Not sure anymore, but believe the 90% silver coins will go for about double or better of face value.Sounds like there could be a few coins of considerable value there.Besides, it would be fun looking at them.Not quite as much fun as chips though.
Good luck,
Rick