Original wills are misplaced all the time. There is a way to get around that. You can simply file it with the Clerk of Courts, in your county of residence in South Dakota. They will store it for you and presumably they will not lose it.
In Baltimore, Maryland, rather than simply leaving the filing of wills to the Clerk of Courts, they have a special office called the Register of Wills. This is an elected office, which by statute is required to provide safe keeping for the last will and testament of living persons.
One can only imagine that it was a source of substantial embarrassment when the person elected to that office could not find her own father’s will. In her petition filed with the court to have the will admitted to probate, the Maryland County Register of Wills had to admit that she could not find it. It had apparently never been filed with her o