There used to be a cache here (tribute cache- borringgirl GC2G68B) that gave me fits trying to find. Once it got archived I thought, "we need an easier find here!"
Cache is a small magnetic key holder in a high position. May require the slightest bit of climbing, or a friend giving you a ride on their shoulders. :)
Try to replace it tucked in like you found it. Muggles everywhere so beware!
Ondago nails the FTF!