Just like a counterfeit bill, they made the fake look as much like the real thing as possible. Just like the counterfeit bill, the fake doesn’t disprove the real thing.It didn't look like any real thing. A counterfeit bill is intended to look like something that actually exists. Therefore that analogy makes no sense.
Therefore, your statement that it doesn't disprove the real thing makes no sense.
On the contrary, it looks like a fossil that you might expect to find. Otherwise no one would b fooled.