I scanned and printed a copy of our cards, and the wife put those copies in her purse...in case we go somewhere where proof is required. We keep the originals at home, because getting a new card would probably be a hassle, if it got lost. For awhile, the Staples stores were offering to laminate these cards, for free, but after getting some reports about the lamination causing the cards to be unreadable, they stopped that offer.
So far, we haven't been anywhere where proof was required, but if this virus continues unchecked that may very well change.