It's just an interesting sign, one of many i hope to find. It's at the gate of a good mate of mine. He knows the cache is there. You can reach the cache if you have a good reach or a grab tool, but he doesn't mind if you go in his "yard" to retrieve it... bush rules if the gate is shut, close it after you.
You are looking for a camo'd gatorade contrainer, contains log and pencil and swaps. I have upgraded the container so this can act as the barrier's trackable hotel