The Spanish are TOTALLY OBSESSED
with copies of documents, you'll need to present a copy of your passport NIE NIF so many times you may lose the will to live.
Even with the same office on different occasions there seems to be the need to represent; there must be at least 10-50 copies of every document floating around out there, at least in the Canary Islands
The idea of having some acceptable co-operative authority that can be referenced is akin to alien technology.
You may detect an air of frustration with the tone of this column.
Be prepared for any action involving a purchase, registration, change of details, request for a service, change of a service or literally anything that involves any type of interaction in any way with any business or any institution.
This goes for little things like getting your telephones SIM card copied, collecting a prescription, sending or collecting a document from the post office : any kind of contract any kind of service any kind of interaction that involves any kind of data exchange.