2CD Mystery Board set?

Anybody know anything about the 2 CD set entitled Mystery Board?

Live set from two dates in 1972 according to this ebay listing: http://cgi.ebay.com/SUN-RA-RARE-2-CD-SET-1972-MYSTERY-BOARD_W0QQitemZ4759718686QQcategoryZ307QQrdZ1QQcmdZViewItem

I suppose its a boot, but I don't recall ever seeing this date being traded...