Good evening Bullet Giraffe!
From my experience running and participating in Co-op bundles, the cuts of the bundle is automatically distributed between everybody as soon as a sale is made. As the sale progressed, for every bundle sold you should have seen your cut in money made. If you go to Dashboard -> Earnings -> Payments, you should be able to see a long history of earnings made. If you did in fact receive the cut of the bundle, there should be plenty of transactions shown around the time the bundle was active.
Even as the runner of the bundle, I only receive my cut; I have no access one way or another to the rest of the cuts, as they're handled by Itch and Itch alone.
Let me know what you find or if you have any more questions!
- TheTominator