I would be surprised if it last for 10 days on eBay. eBay tends to cut short the Atari multicart auctions. Some people have been suspended for listing them. You might be better off trying to sell it in the marketplace here.
Probably just dont use the word "prototype" in your description...that's likely what triggers the item being pulled (just my guess).
The Keyword is "multicart"
in any way shape or form... I tried listing mine like three months ago and I was RED FLAGGED at the time of listing.
I listed mine for one day anyway and it never sold on ebay. But I tried. I later received an e mail from ebay saying that I listed a prohibited item and that "maybe you didn't know" and bla bla bla.
I was never able to pull the "ended" auction. It was blocked by ebay.
I sold it later on last month here in the Marketplace.
Is it risky? Yes, I would say so