Pre-Register Bidders - applies only to live events: Do Not have people "pre-register" online (on your public auction webpage) unless they are actually bidding on items online. Bidders will only show up in your Bidder Management view, if they have actually placed a bid on your auction. If they just "pre-register" they will not be part of your auction and you will not be able to view any of their information in your auction manager.
For example: Someone pre-registers online, but does NOT place a bid on your website. He then comes to your event and places a bid on the silent auction bid sheet and uses his bid-number. When you try to record the bid in the system, the bidder will NOT show up, solely, because he is NOT tied to your auction. The person is a BiddingOwl customer, but not associated with YOUR auction. This is to protect their privacy.