One thing you can do to check is ask him to pop the hood, and check the heat shields on the headers (passengers side will be easier). If they are 4 bolt, it's a newer engine. If they have 3 bolts, it's an older engine. Header design was revised somewhere around the 2014 year model, and the heatshields changed with the headers. If I had concerns, that's where I'd look first.
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2014 370z Touring Sport Magma Red MT // BP Single Turbo 6467 // 63mm TB's // Z1 Ported Upper Mani // RJM Pedal // Zspeed Stage 3 Clutch // 526 WHP, 451 WTQ
2006 350z (Sold) // 1990 300zx (Sold) // 1985 300zx 2+2 (Sold)
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