I should have considered this too . And if you have a paper guidebook with empty pages (
Brierley books had/ have those ) or a A4 piece of paper ( ask around to somebody) of similar put the stamps there from the rest of your journey
And show your pictures at the desk. You are too early but if.. I am volunteering in September coming
Good luck and bom caminho
Maybe la Refúxio de la Jerezana albergue in Cessantes will have new credentials available 3 kms from Redondela in the direction of Pontevedra. At the big crossing of the N550 upon arriving there turn to the right and follow the N550 about 150 meters and the albergue is at your right. Ask Maria. She is the owner for a crendential or an A4 wíth a stamp of her albergue. That will be your first then