Oh no! Someone came and removed all the kitty-litter on the pad! For the last few years, Murdoch couldn't be bothered to pay attention to this piece of property, but now that there was a partial solution to the problem, somebody got motivated to start cleaning and they removed the solution! I wonder if it's possible to source some used kitty litter somewhere.
*Update* We did actually find some used kitty-litter to put down, but it was so gross, we couldn't bring ourselves to do it.