without having some knowledge of the nature of the collection. How many, how valuable, what condition, etc.

That said, I would put them up on eBay, either as singles or groups, after learning a little about the values and grading so he can describe them well.

The CCGTCC website is a good place to learn grading, and your library might have copies of The Chip Rack and The Official U.S. Casino Chip Price Guide.