Google points to
http://www.undergroundhiphop.com/sto...?UPC=MSG8001CD which explains that it's a box set of a whole lot of live bootlegs from the era complete with dvd mp3 data disc of all tracks. It's from a company calling itself Madison Square Garage Recordings.
I got these two from dime awhile back:
Grandmaster Flash & The Furious Five
12/23/78 Auto Bonn Ballroom NYC sbd
3/25/83 The Peppermint Lounge NYC aud x2 discs