What would do to liquidate these old Athearn blue boxes?

As I’ve posted before, I’m trying to clean out my Dad’s lifetime collection of trains.

I believe 90% of these are brand new, never used… but as you can see by the box they are years old.

They’ve been stored inside so they are in good shape, but some of the locomotives may not do well since they’ve been sitting so long?

And trying to list some of them on an auction seems like not a great idea because of shipping costs.

Any thoughts or ideas?

I’ve been selling off small groups of 4/5 grouping them by road name, there are so many that only have 1-2 from the same road name.