The seller is probably referring to the "sport" package as an "M-sport" package which is a stretch. It does give you sport seats, suspension, steering wheel and wheels, but it does not have the "M" logo on it. I would not worry about 100k miles if it has had all its maintenance up to date. It is a nicely optioned car but the price does seem high, the equivalent car in the US would be around 16K euros. Good luck.