Certificate of Good Conduct - Travel to get it in person?

Hey there! So I’m trying to get my Certificate of Good Conduct from Germany (lived in Germany for 1y and left).

🤔I’ve gone through the process of applying from abroad, sending an officially certified form + proof of payment. I tried it twice in the past 5 months but had not heard back from them.

❗️Now I’m really considering travelling to Germany and get it in person. The website says that:

“Certificates of conduct can also be collected in person at the Federal Office of Justice. You can only do this if you bring both the original application handed to you at the residents’ registration authority and official photographic identification.”

❓My question is: am I supposed to go first to the residents’ registration office? are they gonna hand me over a certain document to take with me to Bonn? is the residents’ registration office gonna accept me even though I don’t have any document showing that I currently live in Germany (since I already left)?

I’m sorry if my questions seem stupid, but I’d rather have everything super clear before planning a trip to Germany! 😊