You can access this report under Reporting / Items / Top Silent By Revenue on the left-hand side of your auction manager.
This report is going to break down the top silent auction items by revenue.
Top Silent By Revenue
This report is going to show the item name, the category, the number of bids on the item, starting price, ending price and the percentage gained on the item.
The items in the report will be ordered by the items with the highest ending prices.