5 players x 2 resources x 7 max per resource is 70 tokens.
You'd need 2 types of tokens, would need to monitor if people go over the limit. The box is not that big so an extra 70 tokens will get snug.
And this would be assuming it is a good idea to play this game with 5 players. I would beg to differ. Personally, I would not play this game with more than 3.