Lots of live auctions do not tell you if there are reserves or what the reserves are. I can't recall ever hearing any live auction house announce a reserved item come to think of it. Did you hear the announcement that it sold to the floor or was it announced via an online third party like Proxibid or Invaluable via text? Might have just been the default response for those programs if the item isn't sold to an online bidder.
The Ebay thing is weird. Here is their reserve policy:
"A reserve price is a hidden minimum price—essentially, the lowest price that the seller is willing to accept for the item. If the listing ends without any bids that meet the reserve price, the seller is not required to sell the item.
As a buyer, you are not shown the reserve price. As you bid on an auction-style listing with a reserve price, pay attention to the label next to the current bid price to see if the reserve has been met. Once the reserve has been met, the "reserve not met" label will be removed."
Was there a reserve not met label?