Do you have any idea how many thousands and thousands of supposed fakes you're talking about? Scientists would have to have a factory to produce the number of fakes you claim. Here's my favorite fake, a whale with legs:
actually, a province in china has a factory just for such a thing, according to the book China, Inc. They were the ones who produced the first "feathered dinosaur transitional form" proof that was reported in either national geographic or nature, a few years ago.