When I walked out this way on the Lebanon Valley Rail Trail (LVRT), I was surprised there weren't any caches out this way. There is a post with a 10 on one side and a 12 on the other. I'm thinking it's left from the original railroad, but I can't find information online.
This link describes the rail line's history. The Wikipedia article has a map of sorts along with more history.
You are looking for a duct tape wrapped pill bottle.