eBay keeps creaking along precisely because it makes it very easy for people to find the odd junk they crave. It is the exact opposite of a secretive method to fence hot, notorious goods. You'd be better off just putting up a Web site shuttledebris.com.
I suppose you could try to sell fake shuttle debris as seller-side fraud remains an issue eBay battles against constantly. As long as you don't get greedy the penalties for simple fraud have to be less than the 10 years in prison and a $250,000 fine the real debris collectors face. But the law would still find you.
It is a lesson that black market cable box makers recently learned. Private detectives working for cable companies simply responded to an eBay sale in order bring cops down on them.
The Internet was never as anonymous as it seemed.