Fresnillo, Zacatecas ---Where Are The Records???

Looking for my 4th GGrandfather Cipriano Puente born in Fresnillo in 1787 but the records don't go back that far for that location.

Does anyone know why the records for Fresnillo are so few? Were the records lost? The city was established in 1554 so the records must be someplace if not lost.

any thoughts?

Joseph

ps: I did find his MI record for when he married Eduarda Torres in 1813 in Villanueva:
https://www.familysearch.org/ark:/61903/3:1:939N-TTWP-D?i=701&cc=1804458 but the record doesn't really start until page 706