The most common location is a white sticker on the back cover of the "Getting Started" booklet or the full game manual.
The Sims 2 Deluxe was a compilation release that bundled the base Sims 2 game with the Nightlife expansion pack and a bonus DVD. For many years, this was the gold standard for entering The Sims franchise. However, the game was pulled from digital storefronts (like Steam and Origin) in 2014 following the launch of The Sims 4 . sims 2 deluxe cd key