With Tenu's monumental archival effort (who backed up almost every single Crysis map and mod before the website was remodeled) I was able to cross-check every missing map from pack 19 and download them from his archive. Which sadly I cannot link, it can however be found in the comments of the Drivers Hell Trilogy :)
The final missing pack is finished, thus ending my adventure in backing up the Crysis Map-Packs from Gamershell, and should now serve is an archive in case Gamershell goes down. This pack also includes Death V2, perhaps one of the largest single Crysis Maps ever made and a personal favorite of mine, as it was the map that got me into the Crysis map scene :)
If there are any other map-packs that I find elsewhere, even for other game series, I'll try and back them up if the maps found inside cannot be found elsewhere.