On 22 Oct 1963, Nehemiah Robinson, of the World Jewish Congress wrote to Gerichtsassessor Messmer in Munich.  The letter includes a summary in German of the testimony of Nathan Ballon.  It's page 8 of box C210, file 3.

"Nathan BALLON was from Eisiskes.  With 300 others, he was locked into the movie theater in Voronovo.  According to his statement, almost all of them were murdered. (He was able to flee, and a family of three from Velinki was able to bribe themselves.  Mr. Ballon knows that the family lives in Israel, and the father's name.  He will obtain the address for us".