Here are the highest quality Duke Nukem 3D Renders we have. Once again, you might find them in higher quality or the models themselves.
There was cut content from Sunstorm Interactive's Caribbean addon (
for example this enemy and
this version of the Assault Trooper). Any archived copy of the addon could potentially be significant.
A better copy of the Duke Nukem 3D box art. What we got for the XBox Live Arcade version (and later ported over to Megaton) is of inferior quality. It's been photoshopped and cropped. Any alternate version you find could be better than what we have.
As I've mentioned before, there's potentially
voxels out there meant for the Plutonium Pak or Atomic Edition or perhaps a patch after that. As evidenced by the screenshot, they did exist. Dirk says they're from Duke Nukem Forever,
but that is surely a mistake. The med-kit voxel is in Shadow Warrior's files. DNF was announced in April of 1997, and at that time was on the Quake engine. Shadow Warrior was released in May. There's always been a rumour that 3DR was working on making Duke3D as technologically advanced as SW and Blood (likely additions to the engine like SW's advanced Sector-Over-Sector and voxels.) It's likely this was abandoned in favour of kicking PlutPak/Atomic Edition out the door and focusing on Duke Nukem Forever.
This is an extremely rare Duke3D box prototype. 3D Realms might not have even had a copy.
Any snapshot of Total Meltdown or Duke 64 you find could also be significant, as it's known that both have had some cut content.
Anyone who has followed the development of this game/dug into pre-release materials knows that there could literally be drastic changes from one day to the next. I would bet money every single snapshot you have has something significant/interesting compared to other ones.