Invitation to remove a vehicle!

Hello am new in this forum, I bought a used Opel Astra G today, the dealer also gave me his dealer’s license plate for the transfer and from the insurance I had this “EVB” number. Nice and good, the dealer meant but he needs the license plate back as soon as possible. So I parked the Opel on the front door, took the license plate off, packed it in a box and sent it to the post office. A friendly policeman, but also the registration office itself, ha 10 minutes later I wanted to take a picture of my “new” car to show it to my friends 😛 There I noticed a red note on the windshield (see appendix). That’s a joke, isn’t it? Do I have to worry about something if I let the car go directly in the morning? (Today it didn’t work anymore, the registration office only has until 12 o’clock g) Opened) MFG G3Ron1mo