The city called us, this week, with a complaint of vandalism on one of our park signs. They indicated it would most likely need to be replaced, and they were open to that.
Arriving on the scene it was evident there was a baseball sized hole in the background. I was fortunate to find the remaining piece that fell inside the interior cavity. What good luck.
No secret from here except we use PVC Gorilla glue to put it back together. Difficult to tell there was anything amiss. I did place a large PVC backer plate just in case.