Do your research. Ebay is a good place for recent sales. As others have mentioned, completed
sales are a truer gauge of value than unsold listings, (that might never sell because they're unrealistic).
Also look at the marketplace here, and
the lens database.
The wide variance in prices that you're seeing are due to the wide potential value based on
lens condition, rarity, desirability, etc. No real way to pin down a more concrete price without
actually seeing the lenses. If you can, take clear, well lit, in-focus images of the lenses and
post them here. Or seek out a local camera shop or photo club if you don't feel confident in
evaluating the condition of the lenses yourself. If they are truly in excellent to mint you can
expect to get top dollar, (ie, upper prices of what have been paid recently). Useable, problem
free lenses with cosmetic wear will fetch prices in the middle ground. Lenses requiring repair
will fetch considerably less, anywhere from 0% - 30% of top dollar depending, again, on
rarity and desirability.
Overall, you do have some choice lenses there. Do your research and you'll do well.