Always took pics on my phone. I only had to show proof of ownership once and it was at Adventure Outdoors range.
Governors asked for mine.
To those saying you dont have to have them thats true. Ranges dont have the right to ask legally, however remember that you are shooting on their property and if you dont have them they can ask you to leave. Just so I'm not wasting my time I make sure I have them and since Im deciding to shoot at their establish I'll abide by their rules.