The sweet smell means it is fermenting. I hope it wasn't too moist as if it is it will keep fermenting.Alright so the 2 cobs that were in my first batch, the brown ones, they were definitely over done. When I opened the bag they just smelled the same as before, like weed that had been used in a vaporizer. When I unwrapped them they just looked bad and smelled worse. I tossed those two. The other bag fared much better. When I cut it open it smelled sweet, hard to place, but sweet smelling. I didn't unwrap any of those cobs, just re-vacuumed and put back in the drawer. I didn't get any pictures because I was pressed for time, but I have a feeling this bag is on the right step.
Better check it frequently and maybe dry it a bit if its moist. If you leave it too long it may over ferment and go the way of the others.
Its like sailing a boat you have to adapt to the conditions you find yourself in. It is not a rigid mechanical process you need to steer the cure in the direction you want to go by regulating the moisture content and temps during the cure. Use your nose.