Well I just bought a refurbished A1200 top and bottom case from and it arrived with a few marks (acceptable) but a chip out of the side of the top lid. Refurbished in my eyes is tidy, clean and usual wear and tear but damage is damage and should be stated.
I've sent a support claim in so we'll see what happens but, bottom line I guess, is if you're after mint condition then get new-old stock. If you don't mind a few marks then refurbished is perfectly fine. The only issue I have with mine is the damage..everything else is just fine.
Would I buy refurb cases again? Probably but that's only because I'm not aware of anywhere that just sells new cases anymore. If I had the option of new or refurb I'd go new every time and that's simply as if I'm spending the money I want the condition to be reflective of this.
Then again there's Retr0bright...have turned a few disgusting yellow A500/600 cases into ones that you really can't pick from a 'new' one.
It's pot luck really...one man's idea of mint is another one's idea of good. If you're fussy get new...if not get refurb but get pictures if possible.