Just large flats or packers from Sam's?

I was out with the wife at Sam's Club and was curious about their briskets, as I've never purchased one from there before but might do so soon. They were labelled as flats but were cryovac'd and resembled packers. They were $5.67/lb for choice. Some looked decent, but the heavy ones only topped out in the 8 lb range, like large flats and the bigger ones had plenty of fat on the back, so I passed as I was just doing some comparative shopping and my UDS drum is at the sandblaster. So are these just large flats (which is my guess) or does Sam's just label packers as flats?

In contrast, prime packers were up to $8.19/lb at my local butcher and the butts were up to $3.49/lb.

Thanks for the confirmation. That's pretty much what I thought. Ironically, there's a Walmart adjacent to my Sam's as well but I didn't go in to investigate. Will have to do that next time.