Ask the morticians
If you are referring to "Otis" as played by actor Hal Smith on The Andy Griffith Show, his gravesite location is ELT-J-10 which is a crypt on the 1st of the Mausoleum. Enter the building and go directly to the end of the hall and look to your left. If you're still unable to locate, there is a kiosk which provides gravesite locations near the entrance on the left.
Go to this facility's office and ask someone at the front counter.
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