Examples would be nice. Whhat I don't understand is how a creationist could possible conclude that Piltdown or any other find is a hoax or fraud. On what basis?
They don't mind using science, but only when it fits their worldview. If the Shroud of Turin turns out to be 2,000 years old, they'll accept radiometric dating for that one purpose. But not for dating fossils, and certainly not -- gasp! -- for determining the age of the earth.
Similarly, they'll go with science if it shows that some fossil isn't what it was once thought to be. But not for the purpose of showing that millions of other fossils are what they purport to be.
You got a problem wid dat?