I sell autographs and I have never personally sent an item to a TPA service because I have a confidence in what I offer. Not to say I am perfect. But, I offer a 30 day unconditional return policy, for any reason. Plus a guarantee if the autograph fails a TPA opinion I will refund the full purchase price plus the TPA fee.
Perhaps I've been fortunate but, to this date, numerous items I have sold have been submitted by the buyer to a TPA. All have passed. I believe the buyer should be satisfied above all else. They wouldn't have bought it in the first place just to try to send it back. Why make it hard?
I know Philip and have purchased from him from time to time. I believe he would never knowingly sell a questionable autograph intentionally. With that said, I would suggest you try to contact Pete, a member here. He is the best on Connery I know.