how often do you have to “prove the legality” of your marriage by flashing a piece of paper? How often do you ask couples you meet - most of whom you did not witness getting married, for their “papers, papers please.”
I had to in the Army if I wanted her to be recognized as my wife, and as far as I know, there are times in life, especially upon a death, when the proof of legal marriage is asked required.
Would you destroy all records and evidence of your marriage right now?