It's probably fine. The picture he posted looks like a pretty standard one that Chinese resellers use to sell these on ebay, Aliexpress and so forth. Chances are, what he's actually got is a cut tape with 5-10 brand new ones in it. Note that there is no solder on the pads in the photo. If it were used, they'd be tinned.If that MOSFET is not on a board, it's likely fried. MOSFETs don't have continuity either, they are voltage devices, like a valve. You could build a test circuit but like I said, unless this device has been in a proper static free work station and properly protected it's entire life, it is likely dead.