Hi Andrea 

I have a similar case in my family and I found many documents on the Arolsen Archives online and there are also some records in the Swiss Federal Archives.
Maybe you will also find some documents about Alfred Brawer on the Arolsen Archives online and/or the Swiss Federal Archives.
The Arolsen Archives have not all documents online, so you should also write to them and ask if they have some records which are not online.

Arolsen Archives online
https://arolsen-archives.org/suchen-erkunden/suche-online-archiv/

Swiss Federal Archives
https://www.bar.admin.ch/bar/en/home.html

Border crossings Geneva Border
https://www.kopuit.nl/wieiswie/Vluchtelingen.pdf

Historical newspapers Switzerland
https://www.e-newspaperarchives.ch/?l=fr

Do you know the name or place of the internment camp in Switzerland he was in?

Regards
Corinne Iten
from Switzerland