Forgot to add the second line of Box 18,19 and 20 in 2019 return

We filed our 2019 and got accepted and got our refund in Feb 2020. Now I just realized that on the W2 of my wife and I there was another page of W2 simply all blank but with different number on Box 19 and different name on Box 20 and we forgot to add that line when filing our 2019 return. What should we do now? Do we need to file an amendment?