Xbox 360 contents varied wildly by model (Original, S, E), SKU (Core, Arcade, Pro, Elite, Slim bundles), region, and year. There was no single standard bundle.
Check the barcode label on the box for the Model Number (e.g., XBOX 360 250GB Holiday Bundle 2011) or search the Console ID (Settings → System → Console Settings → System Info) against online databases (e.g., Xbox-Scene, Wikipedia "Xbox 360 models").