Generating locales...
  en_US.UTF-8... done
Generation complete.
Using CD-ROM mount point /cdrom/
Identifying... [03902f91f654a30883e3b5acaed5871b-2]
Scanning disc for index files...
Found 4 package indexes, 0 source indexes, 0 translation indexes and 1 signatures
Found label 'BackBox Linux 4.1 - Release amd64'
This disc is called: 
'BackBox Linux 4.1 - Release amd64'
Copying package lists...gpgv: Signature made Wed Jul 23 18:43:52 2014 UTC using DSA key ID FBB75451
gpgv: Good signature from "Ubuntu CD Image Automatic Signing Key <cdimage@ubuntu.com>"

Reading Package Indexes... 0%

Reading Package Indexes... Done
Writing new source list
Source list entries for this disc are:
deb cdrom:[BackBox Linux 4.1 - Release amd64]/ trusty main multiverse restricted universe
Repeat this process for the rest of the CDs in your set.