This is a challenge cache. The cache is at the posted coordinates. Cache hunters are welcome to sign the log at any time but cannot log this as a find until they complete the challenge.
The challenge: Add the number of caches with the “Teamwork Cache” attribute you’ve found. To meet this challenge, your total number must be greater than or equal to 25.
As of 9 Aug 2019, I have found 25 of these attributes. You can use the challenge checker to verify this for yourself.
The Project GC Challenge Checker will verify you qualify; however, I encourage cache hunters to show their list of attributes for others to see.
Enjoy and good hunting!