Her post questioned whether anyone knew about plates being stolen on Roxburgh St, and said she just wanted the plate back, "no questions asked".
Corr woke up again the next morning to find the missing plate perched on her windscreen.
She believed the thief had seen her Facebook post and returned it, saying it was "too much of a coincidence for it to just randomly appear again".
"I was pleasantly surprised but it's still a pain in the arse as the screws are missing, so I'll have to get that fixed, but better than having to report it to the police."
She wasn't sure whether the other cars had their plates returned as they weren't parked on her street anymore.
"I've had people tamper with my car before after nights out but nothing serious, just moving the mirrors and windscreen wipers, stuff like that."
Corr put an update on her Facebook post with a photo of the returned plate.
"Thank you for bringing [it] back anonymous plate person," she wrote.