It's not like third party records did not exist in 1791. The framers, being lawyers and businessmen, would have been intimately familiar with the concept of entrusting their person information to the documents of third parties. Had the framers intended "secure in their persons, houses, papers, and effects" to actually mean "secure in their persons, houses, papers, and effects [and their doctors' or accountants' or lawyers' concerning them]" they could have written the text that way. They didn't.