As suggested, make copies of all your registration cards and get them laminated. I keep a photocopied sheet of all my registration cards in all my range bags, rifle cases etc. I will always have a copy of a registration certificate available, albiet a photocopy, along with a photocopy of my PAL and transport paperwork. The local gun range is only a five minute drive, so if I am ever stopped and questioned further and need the originals, they are not too far away if need be. For hunting trips or trips away from home, I will take copies of any paperwork as well as a laminated copy of my PAL and the registration card for the firearms I am carrying.
It's a good idea to keep a spare set of registration cards in your banks safety deposit box.
Its a good idea, and what the legal, responsible gun owner does, carry any and all paperwork required by law with them at all times when you have that firearm with you. Think of paperwork as part of the team, firearm....trigger lock keys......ammunition.......paperwork. Good to go.