- " 'Start talkin', kid. What else do you know about that book?' / Marty stuck the matchbook in his pocket. Biff was playing right into his hands. Now if he could just get him to tell him a bit more. / 'First,' Marty demanded, 'you tell me how you got it. How, when, where—' / Biff stared at him for another minute. / 'All right,' he agreed at last. He stood up and turned to the oil painting behind him [on the wall behind the desk in his private office] — a full-size portrait of Biff, like he was royalty or something. / He swung the painting out on its hinges, revealing the wall safe behind. / 'November 12, 1955,' he called over his shoulder as he started on the first of the three combination locks. 'That was when.' "
- —From Back to the Future Part II by Craig Shaw Gardner (quote, page 131)
- "Biff opened the safe. He pulled a box off the center shelf, then dug a key out of his pocket and unlocked the box. He grinned and pulled out the Sports Almanac for Marty to see."
- —From Back to the Future Part II by Craig Shaw Gardner (quote, page 132)
A safe was a strong, lockable steel container used to store valuables, which was either freestanding — being bolted to the floor — or secured into a wall. It could be locked and unlocked as required either by means of a key, or a combination lock.
In 1985A, Biff kept the almanac inside a locked metal box in a wall safe behind the desk in his private office at Biff Tannen's Pleasure Paradise Casino & Hotel. The safe was hidden from view behind a large oil painting of Biff himself, and was opened by not one but three combination locks.