The DSP might still show up. It's worthless without the speakers ... I'd print out or email the DSP pictures off the website and give it to them.
That way if they find it they will know what it is ... then wait and see if it turns up. If you paid money for them they should agree to take the speakers back if not found.

In the meantime you can see what Axiom can do for you on getting a DSP at some reasonable number ... Good Luck ...