I would agree that your best course is to get an assessment of the collection by a natural history curator. Are there any clues on the boxes or anywhere else in the collection pieces that might give an idea of who collected them and why? Any documentation from the antique store? That would certainly increase the scientific value, and possibly the monetary value as well. It's basically a curiosity antique, and I would say the resale value would be around what you paid for it. A museum will give you formal paperwork that you can use for tax deduction purposes upon donation so you can claim market value.
I would also suggest not to attempt any repair of the broken eggs, especially if pieces of the shells are missing.