I collect Braves only, and have seen forged Gregg Olsen sigs, faked Eddie Perez...etc! It boggled my mind that someone would bother with either but...people are greedy.
One thing seeing that fake Olsen did was teach me that I needed to learn my sigs as much as possible and also find some reliable resources to use for comparison. Don't assume just because this is the backup catcher that the auto will be genuine. LEARN YOUR PLAYER AUTOS!