I submitted a renewal application for my residence permit at the Landesamt für Einwanderung in Berlin last October, but the office is so overloaded that my permit expired before I received the new one. I am planning to leave the country for a month, and my current permit is a sticker in my passport. It might be worth noting that that it was a collective application through my university.
Is it possible for me to re-enter Germany if I have an official paper stating that my application was submitted, even though I don't have my residence permit? I am normally allowed to enter Germany as a tourist for 3 months without a visa due to my nationality.