It seems you might be referring to a few different things:
* Modern Warfare 2 (2022) Season Pass: This gives you access to all the content released for the game during its current year, including maps, weapons, and other items. It's NOT a "stimulus package" in the sense of being free.
* Modern Warfare 2 (2009) DLC: This game had downloadable content like map packs, weapon packs, and other additions. These were not free and required purchase, so they weren't a "stimulus package" either.
* Free Content Updates: Developers of both games released new content for free over time, such as new weapons, maps, or modes. This is not a "stimulus package," but it's content that players received without purchasing anything extra.
To be more specific, could you clarify what you mean by "stimulus package"? What type of content are you looking for?