Best of luck with the sale. If it comes down to these not being sold and you really have to get rid of them, consider contacting DDM. I recall a thread by DDM where they might buy back all these CO's (you have to check with re: original ownership vs. second hand).
I have these coilovers I was curious as to what the threads on the rears are for? Cause it seems you can't adjust height with them cause you can move the end cap up.