That is a great link, which highlights a big problem for collectors like myself. When I purchase a vintage whisky (or rum) I always ask the seller to prove the bottle is what he says it is. If I do not have a trail of receipts back to the original store of purchase, I do not buy the bottle. If I do not have documented proof of proper storage, I do not buy the bottle. If the seal looks dodgy in any way, I do not buy the bottle. And if the person selling the bottle has no knowledge of why these points are important, I do not buy the bottle.
This means that absolutely nothing on Ebay interests me, in fact about 99 % of all items offered for sale do not interest me. Over time I suspect all serious collectors will follow suit as it is too easy to fake labels or reseal opened bottles.