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davidcyclebackA lot of the stuff is very desirable, and you would have no trouble selling them for good money with certification form PSA/DNA, JSA or Richard Simon. I think you can get group discounts from them. DiMaggio, Mantle, Williams, 500 HR balls, etc are in high demand these days. A Mantle/Maris and Mantle/Ted/Joe photos with LOAs would sell for big bucks.
You could also consign it through an auction house and let them worry about the details of getting the LOAs. I would think any of the big auction houses would consider taking a lot like that.
For stuff like that, my question is where you got them. If you purchased them from a respected autograph dealer or source, like Simon, then outside authentication is less of a concern.