m0useanswered grow question 10 months ago I agree, should be fine if it was kept on a dry place. high RH decreases carbon filters effectiveness.
I it was stored when it was kinda damp it might have a bad smell but should be gone after running it for a while. if its all metal can pop it in the oven at 350 for 1hr as a refresh. but it will release all the smells. and some filters have plastic seals/washers in them and they are not good in the oven.