I'd say this here is one of the more interesting bits 😀
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EDIT: I don't have any Geforce 1 cards of my own and the pic quality isn't great, so I can't really determine where these heatsinks originated from.
But it's very well possible these heatsinks are not original to the CT-6970. The fan situation is definitely not their original state as GF1 cards always came with one (afaik) and the fan Creative used was different.
The Winfast fan is from some other card.
Looks like one of the previous owners tried to mix and match heatsinks. It could also explain why one of the fan headers seem to be missing the plastic fan thingy part, it may have gotten yanked out as the previous owner was messing around with the GPU coolers.
So I don't know if this will seriously degrade their value since I've always been more of an actual user of hardware and get hardware with the intend to use it and not to put it in a glass case and have people look at it. So for me it wouldn't make much difference since it shouldn't be too hard to create some effective cooling for these GPUs. But for some hardcore collector that wants everything as original as possible, this may not be what he wants.
And on top of that, this (the way these cards seem to have been treated in the past) increases the chance that one of the cards have gotten damaged (and I don't mean just that one plastic fan header part).
I've never seen someone use an actual screw to replace a missing push pin. I'd be seriously worried to damage the PCB that way.
I hope that's not a screw 🤣
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The Voodoo 2 alone could be worth it though (even though I still find todays prices somewhat ridiculous), if it is the 12MB version and if it works.