Lots of good catches here already. One thing that always raises my radar on these is the exclusive use of weird angles in the photos so you don’t get a real clean look at the body shape and proportions, parts placement and positioning, etc. Lack of a clear look at the neck heel also raises suspicion - Gibson has changed the heel shape over time, so it’s harder to use as a verifier, but some of these fakes have really off heel shapes that would jump out.
Remember the owner may not know any of this? Lots of these things are floating around so you never know what they know? Best to walk away. Informing them of your suspicions puts them on defense you think they're a crook.
I'd probably delete the thread at this time from forum concerns about these. Seems there's enough proof of its Chibson origin. The fuzzy logo Grovers are so rough the lettering looks like they were sand cast.