I have the budget jewel case version and mine was also on a separate white card. It was in the jewel case. It might be tucked in the manual.
Or, an even easier solution is on the support page for Black Mirror at the TAC page:
http://www.adventurecompanygames.com...1&sid=11&gid=7
They have some for those who don't have them.
(hopefully one of those works)