The shell goes back. The cover fits in principle already (after the 3rd attempt, I had managed it properly anzubrigen (costs a Grobmotoriker like me about 10 minutes). But: The headphone connection is then no longer possible because of the headphone plug is no longer locks, because the envelope is in the way. The cut-out for the headphone jack is just too small ...
I wanted to use the shell actually a Nexus S i9023