Piltdown was exposed as a hoax primarily because it didn't fit the expectations of evolution.
I'm continually amazed that creationists don't claim it is real and the charge of fakery a coverup.
On what grounds would a creationist claim that Piltdown is a hoax?
Don't forget they used that "unreliable" method, radiometric dating to "prove" the jaw and the skull were different ages. Hah!