I had exactly 50 Knucklebone Tokens in my inventory and completed my set of active hunts, no wild wolf hunt appeared. I then rerolled my hunts 3 times, still no wild wolf hunt.
I then put the 50 tokens up for sale on the Flea Market while I did some campaigning to hunt for more tokens. I removed my listing after a while, claiming my 50 tokens back, and now had a total of 81 tokens. I refreshed my hunts another two times (maxing out my refreshes) and still no wild wolf hunt.
This seems like a bug to me, as I'm pretty sure you're guaranteed to get the hunt if you have 50 tokens in your inventory. I think it may have been caused by the fact that I had listed the 50 tokens for sale (I did cancel the listing and claim them) before doing the first 3 refreshes. Or possibly by the fact that I've unlocked a 6th hunting slot already. I'm not sure though.
If this isn't a bug, and there's just a chance to get the hunt with 50 tokens, I'll delete this thread and move it to suggestions instead. Since it feels a little weird to have something that's a failsafe for having bad luck, still be based on luck somehow.