Allen Cachers: I stopped by to check on the cache today, and found that it was indeed missing again. After not having any trouble with this one for years, and then having it go missing twice over a short period, it appears that the location has been compromised, so we are going to go ahead and archive the cache.
This puzzle was one of our favorites. The kids are much older now, so maybe we'll do something similar in the Spring to see what they are seeing these days. Either way, thanks to everyone who solved the puzzle and found the cache, and for all the kind words and favorite points!