Jasper should certainly be in all units by now. They started appearing in units made about a year ago, first in Arcades. I can't think that they're not 100% of the line up by now (unless you're dealing with a retailer that just doesn't go through a lot of inventory, I suppose).
But if you're worried, peek at the power rating through the slot in the box that shows the barcode, manufacturing date, lot number, etc. If you see 12.1A on the 12V rail, you're golden. Again, I doubt you'll see anything differently.