In Robinson Crusoe Castaways Scenario, will the hatchet and snare keep after camp has been moved?
On page 13 of the rules, under Moving the Camp, it states that 


  If there are any +1 resource tokens (as an effect of a built Item) ... you can move [them] with the Camp.


The only limit is that you're only allowed to have a single token per "spot," so if you move your camp with +1 food and +1 wood to a place that already has a +1 food token, you lose the extra +1 food token.

So keep the tokens, keep your inventions, and move the tokens with the camp.