And another for $581 NIB and one for $456 NIB plus one in "excellent" condition ( no box ) for $200.00.
As my friend Captain Obvious once noted, it is always wise to consider multiple auctions, rather than just the highest of the bunch, when trying to determine value. I would personally disregard the $200 auction - if you look at the photos, the firearm shows substantial wear (the seller described it as "good" condition). The other 3 firearms were in much better condition and included extras (box, papers, mags, etc.); if you average the winning bids for those 3, you get $556.
Looking at the bid history on an auction is also important - some auctions go way too high because a couple of bidders get into a 'pissing contest'. That may have happened on the $630 auction, because you can see that there were 3 bidders up to the $515 mark, but the final $115 increase was due to just 2 bidders. For the other two auctions, there were 3 bidders up to $556 (on the $581 auction) and 3 bidders up to $415 (on the $456 auction). If you average those points where the third bidder dropped out, you get $495.
Other factors influence bidding as well. Buyers on GunBroker usually have to pay for shipping; of the 3 auctions we're considering the highest ($630 winning bid) had free shipping, and the lowest ($456 top bid) had the highest associated shipping charge, at $45. So, no surprise there! In addition, sales tax and transfer fees (if any) can obviously influence bidding.
Before the Wu Flu, when I was buying P-series handguns on GunBroker, I could find very good to excellent examples in the $200-$250 price range (IIRC, the last two I bought were a nice KP93DC for $180, and a nice KP94DAO for $210). I think those days are long gone.