A few had managed to hide their identity, some who had fled Germany returned after the war. But was post WW2 Germany safe for jews to live in?
/u/commiespaceinvader has previously answered:
/u/estherke has previously answered What was life like for those freed from Nazi concentration camps in the weeks and months following their liberation?
EDIT: Note that there are more answers to be written, these are just a few that explore similar themes to your question.