Your post is a little confusing...what do you mean you narrowed it down to 3 days and 7 hours? Anyway, not enough info to hazard a guess why the listing doesn't show
But about making it private...You can read on any bidding history page that ALL bidders are now showing as y*****z except to the seller. The seller can see the actual user ID. (New safety feature) However, when the auction is over and there is a winner, the full user ID is visible to everyone. To actually make it a PRIVATE auction, the only way I could find to set this up is to revise your listing through Ebay. If there is a preference to set for this, I couldn't find it. When you click on revise, scroll down til you get to "Choose how you'd like to sell your item". Click the blue 'Add or Remove Option' link right next to it. The pop-up will give you the option to make it private...THEN when someone bids it will say bidder's identity kept private, or something like that. And yes, be sure to check the private box in Auctiva.
As far as why your listing doesn't show...no idea. Can you provide more info?