Lo que dicen unos "papeles" sociales del siglo XVI que hay en Guernica

In the Archives of Gernika-Lumo there is a document that presents the accounts of the rebuilding of the church of Santa María de Torresandino in 1569. Torresandino belongs to Burgos, and it seems be that a group of Basque stone-cutters rebuilt this church. However, it is not known why this documentation ended up is in the Gernika-Lumo