I also have my seeds written on paper and laminated it. Buried it underground enclosed in a waterproof capsule. Lamination for added protection, and buried underground to be fireproof. I also create several backups of my seeds on flash disks. Having both digital and tangible backups also help in case an unexpected thing happens.
Lol it looks you are extremely paranoid to laminate and bury it underground. But hey who knows maybe you have a really lot of money invested in it. Never hurts to be extra safe though.
Keeping it on paper with writing on it is fine, and the important paper is not buried underground but is stored in a safe. Burying underground is not guaranteed to be safe from natural disasters. Paper landslides can be lost.