Here's a link to information on the production. There are three references to the TK-40's, in the *To Serve Man* production: a reference to 'cameras' in the UN scenes, a reference to the 'lens' on the left side camera, and the names of the actors who played the cameramen,
Alas, nothing more about the cameras themselves,
As to what happened to them, probably something like this (from another site): "During the 18-day auction of MGM props, costumes, and memorabilia that took place in May 1970...."
http://www.retrogalaxy.com/entertain...e-serveman.asp
Pete