Looking for baptismal church records from San Miguel El Alto between 1812 through 1820

I'm searching for the baptismal record of an ancestor and the book Baustimos 1805-1821 is missing years 1812-1820 starting at image 351. There are 3 records from 1814, 1 from 1815 and 1 from 1818 so it looks like no pages are missing, just content. Is anyone aware of where these records might be recorded or is this a loss cause?

Thank you for any knowledge you can share in this mystery.

Sylvia L.