score:15
To talk about numbers, one has to talk about the definitions first. The Nazi definition of Jews was racist drivel, but it is relevant because it guided their persecutions. Counting the members in organized Jewish congregations would miss non-religious Jews. That being said, some numbers can be found in Wikipedia if one looks for the right keywords:
As you guessed, the situation was rather awkward. Several groups in Germany attempted to reach out and provide restitution, but most of the victims were dead. Other Germans were reluctant to return goods which were taken during the so-called Aryanization and reacted with anger if the previous owners showed up.
Any posted signs and publications in the immediate post-war period would have been controlled by the occupation forces. Later on there were strict laws against hate speech, but enforcement could vary depending on the bias of the prosecutors and judges, many of whom had worked under Nazi rule.