In my state, you do not get away just because you escaped, that is not a defense. I believe he can still issue a ticket.
THE COP'S BIG PROBLEM: How does he know who was driving the car? Just because it is your car does not mean you were driving and you do not have to testify (5th Amendment).
My standard disclaimer: I am not offering legal advice, assume I do
not know the law in your state or at all for that matter and that I am
just making suggestions for starting points for when you do speak with
an attorney. Do NOT rely on anything I write and contact a lawyer in
your area immediately after reading my posting.
Getting away before being caught in the car you were driving is not a viable excuse or legal defense to violation of traffic laws. Cars have plate numbers so that the authorities can catch people that violate traffic laws with or without them actually being in the car when the police write the ticket.
My guess is this just isn't a big enough issue for the cop to get invested in.
But, he can't rightfully leave a ticket on the car. Speeding is not a parking violation; it is a moving violation. He has to ticket the driver. If he got your license plate number then he can look up the RO and conduct an investigation (the cop is not likely to go through the trouble for a simple speeding ticket). Assuming it was impossible for him to see the driver, he would not be able to ID you even if he saw you at a later time. If he has no aversion to lying, though, he could claim to recognize you as the driver.
In order to legitimately ticket you, he would have to get you to admit that you were driving. Don't do that. Ditto with the probation officer. You do not need to - nor should you - say anything to the cop (PO) if confronted about who was recently driving the car. You have a 5th Amendment right to remain silent now and at trial. Use it.