Deputy Big D: This cache was muggled and due to costs involved, I am not going to replace.
This was a black hollowed out sprinkler head assembly placed in a black tube in the ground (for easy cache removal). It was placed up against a post so as to be unobtrusive and hopefully blend in when muggles were around. Apparently, I was wrong as not only was the cache taken, but the tube that was embedded in the ground as well.
Thanks for looking.