Found basically in the middle of bushland in suburban Brisbane. To get here requires walking through overrun dirt paths that pretty clearly haven't been visited in a long while.
Not 100% sure I remember correctly, but I think the "BCC" part might be waist height, with the whole thing being taller than me.
It's quite close to a creek, there are a few big manholes around the area clearly above some sort of water, and I think all those padlocks are doing is blocking off access to the hollow inside of the pole, so you could be onto something .