Welcome to chow!
PB has thier own website. I am baffled what makes you ask the question here.
According to them:
<<What is the shelf life of PB2?
Unopened, your PB2 is good for 10 to 12 months. Once opened, please consume within 4-6 months and store in a cool, dry place.>>
So I would say no and Amazon should take it back.
You can also contact them directly: