If you know this auto to be legit, I'd forego the Quick Opinion and just send it to PSA. Choose the "Authenticate Only" option, as you don't want it graded since both the ball and auto would grade low due to condition. They'll send it back to you in a ball cube with a little sticker on it, which will then correspond to pictures/certification on their website. For example, here is a Griffey ball I sent to them:
https://www.psacard.com/cert/AK85295/dna
That's the route I would take to maximize your profit on the ball, as most buyers would accept that as legit.