Question on signed balls

[honus94566]

I believe this is my first ever post on the memorabilia side of things, I am a vintage card collector but have never dealt much with memorabilia. I have a neighbor that wants to sell some signed balls, a few of them are noteworthy (Mantle, Ott) most of them are newer players such as Killebrew, Aaron etc. He also has a Babe Ruth ball that he's going to consign with REA. But as for these other balls, what is the best "smaller" auction house I should recommend him to for selling the rest of these? Also, if there is a member or two on here with a lot of expertise, I would be interested in messaging you a few photos of the balls to get an opinion on authenticity. I am no expert, but they look good to me. Thanks for any help that can be offered. Also an opinion on a Gehrig autograph he has mounted/framed. If it was vintage cards, I would know exactly what the cards are worth and what he should do with them. But these signed balls, my expertise is seriously lacking!