Is there a smart way to locate a sim's gravestone?

I’m guessing this is only for PC? I’m playing pets on my Xbox, and have lost my urns, but after reading these messages I have hope I might find them. Even though my sim died outside on my plot on what seemed to be even terrain, her urns disappeared when she returned to the netherworld. I logged off the game to see if I could possibly retrieve them and the same thing still happened.