By the way, those insurance cards are a nuisance, at least to me.
I get them in the mail, and toss them on the dining room table, forgetting their existence.
(In Nebraska, one is supposed to have such cards in the glove compartment of one's vehicles.)
Then six months later, I get another one, same fate.
And then a further six months on.....
In October 2008, I was stopped because a headlight in front had burned out, and I wasn't aware of it.
Per procedure, the cop asked to see my "proof of insurance" card, and so I pulled it out.
It had expired in April 2002.
(Same result as yours; he just told me that when I returned home, to find the then-current card, and show it to the county sheriff.)
If one doesn't use something, one tends to forget all about it.
I just went over to the dining room table to check; the card for April-October 2011 is there, but one of the cats chewed it up considerably.