Hi, Morgan!
You've probably already gotten better help from these two than from what I am going to give but here it is, anyway...
My help is only to find out if their graves are there and possibly help you get/see a picture of the headstones.
First, I found only two graves listed in the Trosper Cemetery at FindaGrave.com's site. They are for two people with a surname of Treon. Here's a link:
Find A Grave Search Results
Then I found a BIG list of names at rootsweb's site:
Trosper Cemetery, Daviess County, Missouri
From there, you can link to a picture of the cemetery and even join a list of "Friends of Trosper Cemetery"!
Here's another picture of the cemetery:
Trosper Cemetery
and there are pictures of a few headstones listed in the Trosper Cemetery at:
Missouri Cemeteries
Okay, I'm done!

I sure hope you are successful in getting help from that caretaker! By the way, do you think there's a chance you have distant relatives in that area? They might be willing to check out the cemetery and take care of the headstones for you, too.
MrsGenealogy