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Hello Mr. Nennig,
Thank you for contacting History Hub regarding your ancestors. I took at look at the cemetery for Anna and Joseph Traut. They were buried together with a married headstone. I looked for Hiltgren in the same cemetery, none found. You may be looking for death records and not burial records? Or, maybe they returned to their country of residence? How do you know they are deceased within 1845-1850? Possibly probate records?
Here is a link to our genealogy research page, you may find some helpful tips here.
Or, here is another link to genealogy research on Familysearch.org that may help you.
Another great resource, is the Iowa genealogy research wiki on Familysearch.org.
I hope this information is helpful. Best of luck with your research.