A user here told me once with USCIS, the left hand doesn't know what the right hand does.
Just do the whole thing from the first time again, with a cover letter explaining what had happened, put your proof of delivery notification as a copy from the first time as well.
And then, just wait & kaffee trinken (drink coffee).
Viel Glück / Good Luck
I promise - it'll be okay! ❤️