Yes, if the studio or you hold the rights. AI labs license the code you wrote: C# scripts, gameplay systems, tools, shaders and build pipelines, with their history. Your game stays yours, and you can keep selling it or relaunch it later.
This suits games pulled from the stores, prototypes from game jams that grew, and titles that never shipped. What counts is code. Art, audio and level files are not what labs pay for, and you can leave them out.
Can I license a game that never shipped?
Yes. A game that never reached a store can be worth as much as one that did, because the value is in the code and its history. Long prototypes are often rich in exactly what labs want: systems rewritten several times, tools built along the way and bugs fixed late at night. If the game was made with a publisher, check the contract, since some publishers own the code they funded.
Engine code bought from an asset store or licensed from a vendor is not yours, so it is excluded from what is licensed. Your own gameplay code, tools and the history of how you built them are what count. Modding tools and level editors you wrote qualify too.