I would do some serious preliminary research before donating any material to a museum. Check their mission statement and policies. See if they complement each other and the museum actually follows both. Check out the museum's management and staff. Are they competent, honest, and cognizant of the worth of donated materials?
Does the museum have a system of finding material once it's donated?
These are some of my concerns. Otherwise, I am prone to say just sell the material at fair market value to collectors and museums.