FAFSA Q--market value of privately held stock

Does anyone have any idea how you’re supposed to value privately held stock for FAFSA (and CSS) purposes? It’s not a family business, just an investment. I think the FAFSA just says to use market value, but how do you know what market value is for a privately held company?

Have any shares of this been sold in the not too distant past? The private stock I used to hold reported that kind of thing in the annual newsletter.

Thanks@happymomof1, I’ll ask.