I keep 'em! Like several others, I keep a change jar (wine carafe) that I fill with all of my loose change. I never carry change unless it's from a prior purchase earlier that day. At the end of the day, it all goes in my jar. When it's full, I roll the silver coins and take the pennies to the grocery store to have the money counting machine tally up what I have and then use the penny money on :beer: 😀.
Don't put your silver in those change machines! They charge 7-9% of your total! For pennies, it's not worth the effort to count and roll them. 😉