Whether the other driver was willing to show you his registration or license doesn't matter: if you bumped a parked car--even one parked partially over the line--you were at fault, since it is negligent, or unreasonably careless, to strike a stationary object. Therefore, you would not be able to recover any money from the other driver, the car's owner, or the car's insurer.And while your employer cannot withhold money from your paychecks, they *can* hold you liable for the damage since, as stated above, you were at fault in hitting a stationary vehicle. If they want compensation from you and you don't pay it, they could sue you for the money (the at-fault driver of another's car is responsible to pay for the damage) and, based on what you write, they would almost certainly win. They could also, of course, fire you for damaging their car.