is the owner if the car. Plate (registration) only gives the permssion to drive the car on the road. 單身老貓's suggestion to get money from new buyer sounds like a joke. How can you get money from a potential buyer from the internet? Sue him not to come pickup the car in time????
My suggestion to owner is really depends the value of the car. If the car worth more than 1000, it worth to do something, otherwise forget the it. If you decide to persue it, check your lease to see whether there is anything in the lease that says no no-plate vehicle is allowed in the parking lot otherwise will be towed alway. I am not famillar with the law but I feel that your apartment don;t have the right to release這部車to Auto part company without your permission