Hey Rosaly,
Sorry for the late answer, live has been pretty busy. Thank you for your fast answer tho☺️ The embassy luckily answered to my email super fast (within one day) and it was clear that my packet 3 was lost in mail. They send it on June 10th and it did never get here. They send me a link (https://travel.state.gov/content/travel/en/us-visas/visa-information-resources/list-of-posts-k1-k3-visas.html) to the instructions within the Email and I'm completing the checklist rn. I have my medical appointment and embassy appointment now🥳 both in Frankfurt (August 12th and 13th). So thank you so much for your help!
Sadly I don't know an answer to your recent question, but my fiance is also about to send me a document so I might be able to answer it soon if you haven't gotten an answer yet.
Until then best of luck for your interview next week🥰