This cache is one of fifteen that you will need to find to get to Definition of Insanity [Final] (GC2MR1W).
It is a camouflaged micro and it is in a rather obvious spot.
If you are a stamp or sticker user, please be kind to other finders and try to keep your signature to a reasonable size for the event.
The number required for the final is written both on the inside of the lid and the top of the first page of the logbook. Be sure to record it so you can get there!