@nicoldo64 .Yes,understood,it seems they were issued separately,but seems they just forgot/couldn't be bothered to remove "Disc 1","Disc 2" from the artwork ;)
@nicoldo64.Hi,i presume these were available separately then,and not part of the DPBOX400 set of 4CD'S like the one i added (although it's a home-made copy),only it's curious that they still have "DISC1","DISC2" etc on spines and Discs,strange;)
(addenda...just took a look on Discogs and they also have the 4 Discs entered separately,and not as one box-set,so they must have been issued that way)