For god sake it's only some bloody fuel! Man up and buy your bloody own, he didn't have to send it and usually courier companies won't send open fuel anyway, he probably checked this with the courier company he used before sending to make sure, it's what I would have done. You have the car so what's the problem? Even sending sealed bottles of fuel is problematic, it's why online retailers such as MS and JE will only send packages containing fuel via UK Mail, as they're about the only ones allowed to do so, it's also why I still have some Model Technics 25% in here after selling my Hyper ST, despite not having an rc at the moment. I don't believe he should be bad mouthed or receive bad feedback over this, he didn't send the fuel, so what? It's not the end of the world. You spent the money on the car so you should have some left to go to your LHS and buy some so put up and shut up!
Lee.