Don’t take “the courthouse burned” to mean that every record before that point in time was destroyed.
It might be that in reality, records from some offices survived, some offices’ records were not completely destroyed, etc. In some cases, records might have been “re-recorded” after the fire. There may also be state or federal records that provide similar information. Ask around.
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The court house in my home town county was flooded in the 1937 Mississippi River flood and the records were damaged but not lost. Some of the records regarding some of my ancestors were damaged but there was still enough to read and gain information.