I've just been looking at an auction (and there is definately a qty of just 1)
And this statement is underneath the "bids" column:
Important : Multiple items available. See more info links above in the "Bid" or "BuyNow" forms..
I think it should be preceeded by: "If there are"....
or
If multiple items are available, please see the more info. links above, in the "Bid" or "Buy Now" forms.
Yvonne x