You may not necessarily have the original I-797, but only the copy.
Let your hubby call the Port of Entry he intends to land and ask them about the situation and if they accept just copy of I-797. He may say the original is in the hand of employer. They can check the number anyway.
Let your hubby call the Port of Entry he intends to land and ask them about the situation and if they accept just copy of I-797. He may say the original is in the hand of employer. They can check the number anyway.