When you log in as a manager, you'll find that information on the first page.
Log in to your manager account via: https://www.biddingowl.com/Manager/index.cfm
Click on Alerts > scroll all the way down to the bottom > view Your Auction At A Glance.
Alternatively, you could go to Items > Export Items and tally the spreadsheet.
Please Note: Exporting your items exports a copy of your items. So, feel free to export as needed.