So I am assuming the mailbox is between the two driveways?
I'd move it to the other side, otherwise that could happen again. I really would like to have seen that happen, though. I bet it was quite the show. Hahaha
FWIW, shortly after our first winter in our place, we went and got the Mail Swing. It is the absolute best invention ever. Well, as far as mailboxes go. When you have snow plow drivers that put a notch in their blade for every box they take out, you have to fight back.
MailSwing Mailboxes | Swing Away Mailbox Arm Prevents Snowplow Damage