I stumbled on their website and it's kinda weird.
All NOS stuff from over 25 years ago and more.
Very Expensive, charging full price on old junk.
Lots of oddball and no name stuff of dubious quality.
I saw one or 2 items I would consider, BUT they take no credit cards, just money orders, checks or COD.
In this day and age that's weird. Although I suspect it's so a buyer can't initiate a charge back when their purchase does'nt work out.

So has anyone done business with these folks?

http://www.jackbergsales.com/

They are legitimate. Expensive, but legit.

About 6-7 years ago, they had some good models of boxes available, but they are all long gone.

A former member posted some pictures of their storage room: most of the packaging looked extremely exposed to weather/humidity and in very poor shape. I wouldn't buy anything from them without going to the store and plugging it in first.