Only looked at about a dozen or two. Seems like the ones having more descriptive cyrillic text but not fragments. Greetings and homage to some nobles were the

Only looked at about a dozen or two. Seems like the ones having more descriptive cyrillic text but not fragments. Greetings and homage to some nobles were there, with some monetary records and religious material. Where some of these were made it's always possible there was only one literate person at the time for miles around. Might even represent generations of official recordkeeping which lucked out being preserved more reliably than personal "papers" might be. OTOH some of these could be IOU's which would basically amount to a form of "paper" money. No printing, no pen, no ink, no paper! If so, individuals would probably hang on to them pretty tightly. Also in illiterate situations there can be a lot of superstition about documents which are widely recognized as disproportionally important, because almost nobody can actually read them.