I remember reading a story about Tommi Makinen keeping one of the works cars in his personal collection. One of the journalists from Autosport (or one of the mags) drove it when doing an interview at his home and rolled it - he was bricking it that he'd have to pay for fixing it but Makinen just laughed it off. If the SlowlySideways bit is correct and there are only 3 left and only 2 in the wild, then his must be one of those, dead or off the radar.