Well per his listing, if you dont like it send it back, even the shipping is free. Almost as if you can do a mail order of sorts, but yeah, you wont be getting any homeruns, just generic graded coins.
My policy if you can't see it don't buy it - That way you will not be disappointed, sounds more like a scam
Buy the coin, not the holder! The coin in the slab is worth around $.60, unless you spend $150+ you will not get anything decent.