https://www.polygon.com/2018/9/23/17893004/shadow-of-the-tomb-raider-letter-from-natla-alternate-scene-ending

Without its day-one patch, Shadow of the Tomb Raider has a different post-credits cutscene, one that the game’s studio says was mistakenly included in the game.

The discovery comes from the Tomb Raider Forums this week (and also seen by Kotaku on Friday). If you’ve patched the game, you’d never know of this. The person who originally mentioned it in the forums didn’t know what they were looking at, either, and the others didn’t believe them at first.