There are plenty of clues and witnesses in historic time that don't exist in the prehistoric past.
Isn't the only difference between pre-history and history the presence of written records?
In forensics are not many, many crimes "solved" with no witnesses and no written records of the event?
Other than a witness or a written description (or a picture I guess) what is the difference between a clue that is 10 minutes old -- 10 days old -- 10 years old -- 1,000 years old or 100, 000 years old?
Are all the crimes "solved" without witnesses or a written description of the crime a miscarriage of justice?