You are looking for a 400ml Sistema container painted black, which contains a log and pen, as well as some swaps. There is also a "First To Find" token. Located at the base of a tree, between the old railway track (now a dirt road) and a sealed road. Easily accessed from either side and you can park a car on either. Nearby property on the sealed road has a dog which likes to bark, so perhaps park away from it.
Should be easy find, so no hint for the moment.