I found a round brown filter in my driveway when I drove back home after running errands.
Is there any chance this thing fell off my car?
I have a mechanic appointment booked next week for regular service and wonder if I’m safe just driving around until then.
Open your hood and check if you were using Modified k&n filter or else. If you never installed any aftermarket air filter then don’t worry it could be a shop filter 
https://preview.redd.it/wicmrdeqgc2c1.jpeg?width=828&format=pjpg&auto=webp&s=0d4fc29f922243e3676a42859574b5111041e768
Thanks