I'm guessing this sale is from this history: https://backpack.tf/item/7293622218

which would suggest that the Nunhood was dumped a few days after (the mannco sale) to Scrapyard's ~42 key buy order https://gladiator.tf/time-machine?item=Purple+Confetti+Nunhood&at=2022-09-13T07%3A04%3A00.000Z

So if that sale is correct the range could potentially be 37 - 42 keys.

Another option is to leave this outdated since you could argue that both of those are potentially low sales - but I think 37 flat is going to be too low here either way.