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I made the mistake of thinking that the cables were dumb by default and the "smart" electronics were on the boards the cables plugged into.

I designed non USB compliant boards that used USB-C connectors and now my project doesn't work because all cables I find already have some circuitry inside.

Do simple 24 to 24 pin USB connector cables exist and how do I search for them?

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I am not sure about electronics inside the Type-C cable overmolds. Cables with electronics markers on CC lines are pretty hard to find yet.

However, no standard C-C cable has all 24 wires. At least the USB 2.0 D+/D- wires have only one pair of them across the cable, see this assembly table from Type-C specifications,

enter image description here

So, the standard C-C cables have at most 22 wires.

More, if someone wants to use the Type-C connector as a nice generic 24-pin connector for arbitrary set of signals, they would need to make their own cable assembly. The reason is that standard USB cables have 5 pairs of cable wires tightly coupled/twisted to form differential pair, and can't be used for individual signals due to horrible cross-talk.

ADDITION: I'll take it a bit back. Per USB Type-C specification, ALL full-featured C-C cables are required to have eMarkers in overmolds, regardless if it is 3-A rating, or 5-A rating. So the only full-featured cables without eMarkers would be illegal, uncertifiable cables.

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Check Molex cables. Maybe they do not have any electronics inside.

http://www.molex.com/pdm_docs/ps/PS-68798-0001-001.pdf

If yes - check on alibaba who makes them and ask for the "plain" cable only. I was ordering cables for my device (I have done silly mistake when was designing the pcb) with two cables swapped. But I could order 150cables for a very good money.

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