I wouldn't trust any autograph of recently deceased person unless it came from a solid source or has great documentation. I let the dust settle before I make a move. I am always amazed how no one seems to care the day before someone passes. Humans are so predictable and operate way too often on emotion instead of logic.
I agree with Joe in every way, but just in case you care.....both are very real, and I love the B&W Die Hard shot, one I never got the chance to get signed.