Question to the tax experts about company cars

Hello to all tax experts, I have a short question, but first of all the circumstances: I work for an IT company that has its customers across northern Germany. For this reason I have a company car (currently VW Touran) since about 6 years, which I tax over the 1% rule and therefore also use completely private use. A driving book or similar is not kept. Even if I had free or went on vacation, I have always filled with the companies ARAL card, which was never a problem (by the way, all colleagues who have a company car) so besides the money-value advantage to be taxed, I had no further costs, neither refueling, workshop or the like.Now I quit at the end of the year, my last working day is minus remaining leave the 8.12. My contract runs however officially still until 31.12. Now I received from the secretariat the hints that I can only submit fuel receipts until 8.12., after that everything would be pri This is actually contrary to the previous circumstances, where no explicit distinction was made between company and private drivers. Apart from this, it was and is also common practice for us to submit ALL receipts. In principle, I am penalized by the fact that I put my holiday at the end of my service time. The question now is: If I had not actually been entitled to my T to be able to submit without restriction by the end of the year ??