Keep your eyes (and ears) open!
Is it really possible to buy a non-original guitar?
Yes! Furthermore it can happens in unexpected places like a used instruments store, as shown by these two videos made by Kennis Russell:
In the videos are analyzed two incredible fake of the most famous guitars of all time: a Fender Stratocaster and a Gibson Les Paul.
Kennis also provides valuable tips to recognize a non-original guitar.