So there is something suspect, in your estimation, in considering the possibility of...
No. It just strikes me as odd that you would be 100% serious in calling the 'evidence' in the OP "compelling".
It is no more compelling than the Bigfoot body discovered earlier this summer.
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I disagree. The Bigfoot "body" story stunk from the word "go". Known hoaxers who show only photos and refuse to display their "evidence"? Sorry, I suspected "hoax" from the instant that story broke.
Now, admittedly, there isn't much to go on in this instance. However, IF this artifact cannot be demonstrated to be FAKE, then, yes, absolutely, it is COMPELLNG in nature--particularly if the provenance can be verified and a second example, as described in the article, shown.
I would suspect it would be VERY difficult to create an artifical "fossil imprint" that would pass muster of even a cursory examination. Sure, a fake "casting" would be easy as pie to do--hell, I could do that in a couple hours. But to make something that can fool a pro, I'd venture that would be just about impossible.
Note also, that the bigfoot "body" hoax didn't fool anyone either. Some dipshits made some outlandish claims and got called on them when they couldn't support them with evidence. Big deal. That's the way science is SUPPOSED to work. The fact that some assholes do some stpid shit from time to time has no bearing on whether Bigfoot REALLY exists or not. Either it does or doesn't, independent of the actions of these fools.
I considered and read a great deal on this subject over the years and come to the conclusion that the existence of an unknown hominid matching Bigfoot's description is actually the SIMPLEST explanation for resolving all the evidence. I think it LIKELY exists but is relatively rare and QUITE intelligent--enough so that, unlike other creatures, for the most part it consciously chooses to avoid being seen or interacting with humans. Rather than go into a litany of support here, I'll just say, yes, I believe Bigfoot LIKELY exists and if/when verifiable evidence is discovered, I won't be terribly surprised.
If this deal IS a hoax, it'll be shown as such as fast or FASTER than the "dead body" stunt. Whether they'll ever be any follow-up in the media any of us ever hear about either way though, anyone's guess.