I've seen this cases of mix records, specially among the older ones, even worst, some had been indexed but just the "christening" side making it look like there is nothing else within the film, it is until one browse the complete records that we find such information. Luckily for me (if I must put it that way) I realized this the first time I ever browse a film, it was a mere coincidence but it kept me aware of it afterwards.

The sealed document is the accounting records concerning the wealth left by Don Vicente de Saldivar, captain and a miner, who apparently owed lots of money to the crown and many other people, the other people (many captains) are trying to get their payments before the authorities take them all, this type of documents were meant to be in the Spanish Archives but I guess this one never made it.

RJ Quiralta