I always thought most Green Diamond holo/COAs were pretty good and reliable. I remember seeing a post on here where the ones signed by his son (which were the most common forgeries from their Green Diamond COA) were detectable, but I can't recall how easy they were to detect.
Either way, if it looks close enough and there's a Green Diamond holo, I pretty much accept it as authentic (regardless of the TPA cert)...but that could just be me. I generally trust the players' holograms, like Bonds, Ichiro, Stan the Man,etc.
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