FYI, even with a residential permit, you still need to move your car at least every 72 hours:

https://www.sfmta.com/getting-around/parking/how-park-legall... https://www.sfmta.com/services/permits-citations/parking-per...

(Wednesday (presumably afternoon) to Saturday morning is less than 72 hours, though, so it still sounds like that one was illegitimate.)