Haha Hamden.
Anyway, I made it to #18 in pretty sharpish time (with probably the best score I have ever shot on that couse for 8 holes!), and as you can see there is no sign on that piece of grass inside that bunker (you can click on the image to see it larger):
So we can safely say these signs have been 'doctored in', and any real life images or photos won't be of any help.
Note to self: play all comps with starter ball and taking less than 15 seconds per shot.