I posted a picture of M Gaver I had. It was from the mausoleum and there was actually a picture in the memorial page before the request it was just prior to them re-doing the lithochrome on the names and was difficult to read.
The other one, Zimmerman, I am thinking was either tranfered, the plaque is below the grass-line or is unmarked. A-10 according to the plot map is half way between the main gate and the first house on the cemetery side (toward comfort inn) and 10 would be in the first row of plots closest to the street. In this area there is nothing visually there. It is rumored that there are graves in this area from the civil war era.
At some point I am going to digitalize all their grave cards so I will see if I see any records for Zimmerman, but I found nothing visually for William or Lida Zimmerman. There are some William D Zimmermans at Mt. Olivet but not matching those dates.