An ammo can on the TAM trail. This is hidden about 50' off the trail and will require a little scramble up a small hill, which is what makes the terrain a 3.
I put this cache a short bit off the trail to avoid muggles since this is a pretty popular part of the TAM (Trail around Middlebury). It should be fairly easy to spot once you are in the right area.
No hint - I'll wait to see if one is needed.