You're looking for a medium cache with swaps about 30 feet from the trail at Haverford Reserve. Watch out for muggles as you leave the beaten path to search among the trees - you might see one missing some branches. It's away from prying eyes but please recover.
Haverford Reserve Trails are a great way to pass an hour or two with plenty of varied terrain. There are many short trails to explore, creeks, bridges and even an abandoned railroad which is very cool to explore. This one is not too far from the parking area so you could probably do a grab and go in less than a half hour if you're up to the challenge.