Zillow lists Auction.com prices in price history box

[Sam Miller]

If you search on Zillow for a property listed on Auction.com, often in the "Price History" box on Zillow, there are numerous "price changes" listed with the "Source: Auction.com." Anybody know what these numbers represent? Current example here, although I'm sure this link won't be the same as now for future readers of this post: 

https://www.zillow.com/homedetails/2865-Vauxhall-Rd-Vauxhall-NJ-07088/40080996_zpid/