The CIA stopped responding to FOIA with zip disks ages ago.[1] I would expect a hundred megs or so of pdfs/scanned documents to be on a CD-R though; much less expensive than per page copy fees. Can't tell if the disc in question is actually pressed or a writable disc; the label is offset a bit, but not enough for me to get a good idea of the underlying color.

[1] For removal of doubt, I just made that up.