If he packed them how could he NOT know they were mismatched?? Bottom line is you didn't get what you paid for - send him and email and let him know you'll file a dispute for the funds via PayPal (did you send him the $$$ through paypal?) Personally I'd get a refund and send everything back - but you might be able to negotiate if you want one of them.
Hate the 'bay myself - haven't bought anything there in years. Too much hassle most of the time IMO.
Dave
Guitars: Ibanez AF-75, Schecter Solo-6 Custom, Douglas SG
Amps: Fender Princeton 65, Marshall AVT50
Pedals: Metal Muff, MXR Smart Gate, EHX Cathedral Reverb, Digitech RP-255