just shoot it guy. is it in a vacuum? if it is, then I highly doubt it is bunk... usually bunk or weak blues are not even vacuum. did it go from fridge to fridge? if it did, and the supplier packed it cold, then i'm going to go on a limb and say it's probably g2g.
but just shoot it. if you don't feel CT symptoms by the 2nd inject (assuming you are doing 5 iu a day or more), and you don't get the best night of sleep in your life (assuming this is your first gh cycle) then you got burned.