If your CDs are images of the official download ISOs, you could check the CDs against the published MD5 checksums. In Windows I've used
MD5summer in the past to do this.
f7a093af34b8cbe1abc165213fea9deb Mandrake90-cd1-inst.i586.iso
05a3ccafaacc37d6d1e2f260fc274549 Mandrake90-cd2-ext.i586.iso
1a2fd731fb6e30d39b0b99f504b231b3 Mandrake90-cd3-i18n.i586.iso
I suspect the packaging in older Mandrake distros was not very thorough. The 9.1 installer for instance complains of several missing files even though the MD5 checksums of my CDs match the published ones. I didn't encounter any problems actually using 9.1 so it seems the missing files were not critical.
Mandrake 9.0 is from September 2002. After that we had 9.1, 9.2, 10.0, 10.1, and the current release Mandriva LE2005 (aka 10.2). If you have a burner and broadband, or don't mind a few overnight downloads on dialup using a file manager with ftp resume capability, you can download LE2005 from:
ftp://mirror.pacific.net.au/pub2/Man.../iso/10.2/i586
The files you want are Mandriva-Linux-2005-Limited-Edition-Download-CD1.i586.iso, Download-CD2.i586.iso, and Download-CD3.i586.iso