I saw some of those a couple years ago at grocery store that was sponsoring a BBQ competition I was cooking in. The store was raffling some off for customers that joined their "rewards program".
None of the ones I saw were in boxes and I looked them over pretty good and saw no manufacturers markings other than the Sam Adams logo. I too thought they looked like an ECB, but I've never seen a Brinkmann or any of their spawn with an exhaust pipe in the lids.
The doors did not seal very well and they all were out of round.
From a distance they looked cool, but on further investigation they were poor quality. Not worth $45 IMO.