The stash container is one of those Army Surplus Munitions Boxes. Its the smaller sized one, about 5" x 10" x 12". It should be water tight, but just in case, I put each of the goodies in a zip lock.
Its a public park with a trail system, but as I just found out, there is a charge to enter the park (Seasonal, summer only, $6 per person, see Additional Hints) Nice area. It's close to a wooden bridge over a nearby river. The trail system has these numbered pillars on it. Look for number 8, then follow the stone wall off the trail into the woods. Follow it back for about 50 yards to where another wall meets up with it from the left. Its hidden in the adjoining wall about 3' from where they connect.
If you have time while you're there, take a hike through the trail loop in the park. There's a great elevated walk through the middle of the marsh, well worth it.