A couple weeks ago, we were playing a game where we ran out of clue tokens. I think this is the second time it's happened, and we basically just shrugged it off and went on, but now I'm wondering what the official ruling is, if there is an official ruling: are you limited to the number of clue tokens in the box, or are clues considered infinite?
The specific circumstances that allowed this to happen were that we had had the "No One Can Help You Now" environment, which doesn't allow gates to be sealed, for several turns so we were all hoarding clue tokens while we waited for another environment to come up. Meanwhile, nothing had been happening in Dunwich or Innsmouth so most of the unstable locations there still had their original clue tokens. Then, Akachi achieved her personal story, which told us to put clue tokens on all of the unstable locations without gates (which was most of them; we were closing gates, even if we couldn't seal them.) By that point, we only had a handful of clue tokens in the supply, so we distributed them to the unstable locations we were most likely to visit in the next few turns, but it did leave us wondering what we should have done.