Both Andrew and Victoria were buried at a cemetery near where I live. There is nothing to see. They were in what I guess is called a non-perpetual graves. After some 25 years or so, they and the rest of the remains in this section were disinterred. Then the section was excavated some depth. All the remains, coffins, and headstones were placed - or more accurately - dumped in the new excavation. The excavations was deep enough that after everything was covered with earth, the cemetery could sell new plots.
The cemetery did not keep any record of who was placed where, not even in a general sense. The sexton showed me the record that yes, they are buried somewhere in but they don't know where,