The Declasse Gumshoe is a modified variant of the Burrito in Grand Theft Auto: Chinatown Wars. It appears in the missions Sources (PSP) for Chan Jaoming and Scrambled for LCPD undercover officer Wade Heston. The vehicle does not appear in regular gameplay.
In the mission Scrambled, a Gumshoe is parked in an alleyway. The van is locked and it's not possible to hijack it.