1) Call your lawyer and get him to advise you ASAP.
1a) Contact the local police and see if they can send an accident reconstruction guy out there. You may have a hard time getting this done, but if you frame things right, i.e. tell them you are blatantly being defrauded by the Ford dealer then you may get it to work. Beware of any hanky-panky between the dealership and the local police. (maybe they fix their crusiers, or maybe they send a case of donuts to the local precinct on a regular basis)
2) Go to the dealership and take picutres of:
your car.
The area where the accident happened, including the toolbox that was struck.
And anything else that you can think of.
Make sure the service advisor, owner of dealership, etc. is around when you do this. If they give you any crap just walk past them and snap away.
3) Do additional investigation if you have the time/energy, per your lawyer's advice. For example pull the tech's driving record if you have access to do so. See if this guy is a total jackoff. It will strengthen your position against the dealership.
4) Go to the dealership after your lawyer sends him a letter of intent to file a lawsuit, and pick up your refund.
5) If this doesn't work, threaten lawsuit, contacting the BBB, the local press, making a website, etc.
6) After they buy your SVT from you, go buy something besides a Ford, and be happy!

(unless of course you decide to go vintage and not let it within 1000' of a Ford service bay)