The surest way to find a missing part is to order a replacement. 
I bought a used Pro Series M&P CORE with a Leupold Deltapoint last fall. It grouped about 3/4" left at 7 yards and I finally decided to make an adjustment. I was working at my bench, removed the DeltaPoint and fumbled one of the mounting screws. I thought it hit the floor somewhere around here and searched Thursday evening for over an hour with no luck.
I checked again early Friday morning. Those blue milk crates have hundreds of pound of bagged shot and I pulled it all out, looked underneath and swept the area. I also checked everything on the shelf. I did find a small hex nut, a plug screw and some .22 LR shot shells, but no joy...
I called Leupold early Friday afternoon and ordered a couple of replacement screws. Their superb customer service is sending them at no cost.
After the parts were ordered, I want back down to the basement and emptied the milk crates again. The mounting screw magically appeared under one of the crates! Third time's the charm!

I bought a used Pro Series M&P CORE with a Leupold Deltapoint last fall. It grouped about 3/4" left at 7 yards and I finally decided to make an adjustment. I was working at my bench, removed the DeltaPoint and fumbled one of the mounting screws. I thought it hit the floor somewhere around here and searched Thursday evening for over an hour with no luck.
I checked again early Friday morning. Those blue milk crates have hundreds of pound of bagged shot and I pulled it all out, looked underneath and swept the area. I also checked everything on the shelf. I did find a small hex nut, a plug screw and some .22 LR shot shells, but no joy...
I called Leupold early Friday afternoon and ordered a couple of replacement screws. Their superb customer service is sending them at no cost.
After the parts were ordered, I want back down to the basement and emptied the milk crates again. The mounting screw magically appeared under one of the crates! Third time's the charm!
