All Pinarello's are made in the 'far east'. re. Taiwan. They, along with other 'Italian' manufacturers like Bianchi, Willier etc get to describe their bikes (by way of the sticker on the frame stating "Made in Italy" by doing 'completion' work on the frame...painting and transfers. There is a % of total cost which must be completed in the home country in order to make this claim (I think its 40% of total cost), but the raw carbon manufacture is done in Taiwan.
Here are a few articles which explain the carbon bike industry well, and the problem with fakes. This first article includes a screen capture from the Pinarello website noting that they manufacture in the far east (which should meet your 'proof' requirement). The first two articles are from a blogger Cam/CyclingIQ, he's worked in the industry for some time including a number of roles in Asia (including for BMC) and is very well informed on the bike market.
http://cyclingiq.com/2011/12/01/princes-thieves-and-make-believe-pinarello-fights-for-its-name/
This second article names the big 3 Taiwanese OEM manufacturers, you can be pretty certain Pinarello is made by one of these - some manufacturers, including Pinarello are careful about disclosing which one they use.
http://cyclingiq.com/2012/02/14/shadow-optic-the-manufacturing-partner-paradox/
This final article is from Cyclingtips and sort of answers the claims of 'my $500 dogma is just as good as your $5000 one'. It isn't. But if you're happy (not meaning you the OP specifically) with a $500 version, thats up to you.
http://www.cyclingtips.com.au/2011/08/are-all-carbon-bikes-created-equal/
The fakes are made in China. They don't come out the back of the same factory as the originals. The big brands aren't going to put up with that are they? The fakes are made in China from molds which are based on/try to emulate the real versions which is why there are slight differences. The reason why Pinarello's, Cervelo's are so popular for fakes is 1) they are desirable objects to purchasers due to the cost difference between real/fake 2) because they have distinctive frame shapes, the fakes get some credibility. If you were just copying a fairly standard frame shape (eg Scott Addict or a Focus or similar) you could easily just replicate with an open source frame and a few stickers. So making molds of wavey rear chain stays and forks adds to the fake's illusion.