Shimano 105 Di2 part fell off

Hi all, my Shimano 105 Di2 box hit something and a part fell off. Now a wire is visible (picture 1). The part that fell of is included in picture 2. I tried to see where it belongs (picture 3) but I cannot find the position in which it is 100% correct. I asked a friend with the exact same bike for a picture (picture 4) but I am still not able fo figure out how to restore this.

Any help would be really appreciated!