Bit of a tough question as parts are so similar. The older they are the harder it will be as owners will opt for the cheaper 30° North parts. Obvious ones are Losi truck body, look for "losi" wrote on top of the shock caps, the battery box has "LOSI" wrote across the top of the cover. Losi servos. Early ones had a 26cc CY motor later ones I think are 29cc Dynamite? Upto a 32cc Zenoah. What is it been sold as, a v1, v1.5 or a 2.0?
If you can find out, maybe do a Google search for photos and look for the correct style wheels and tyres, body, engine exhaust combo etc. Maybe check the length and width of the truck against known dimensions. 😉