If it was in a large plastic blister pack it is new. You use to be able to buy 1000 primers in a little tiny box because there were just ten tins in there. The past few years Remington has put the cap tins in a blister pack so they can be hung on a hook on the retailer's shelves. A 1000 now comes in a BIG box.
Old on left, new on right. If you got the ones on the right for $2.99 run, do not walk, back there and buy all they have.
Mine are in the blister pack. According to you they are new. And I did buy all that they had and still have a little over a thou of them. wM1