I guess the Chicago album title is "Chicago at Carnegie Hall". That is what is on the edge of the CD box. The cover is an off white with the Chicago logo and that is it. No numbers, though it is the fourth album. It was originally a four album set and now a 4 CD set w/ extras on CD 4.
I just opened it up. Got it for Christmas. It is a miniture duplicate of the original vinyl set. The box, the album sleeves, the picture booklet and the three posters. The booklet has additional archivist information and text on the band members reflections, etc. I think preserving the orignal packaging is a neat idea.
The river keeps a talkin'