I just bought some seekers using buy-it-now. There was an existing bid of about 20k, BIN was 60k. When auctioneer gave me the seekers, it also sent me a bid overage refund of 39k.
Here's a transfer log of that:
auctioneer ottar 7,816 Seeker Arrows [11x1] (+0) (end-auction 77433) 2:07 PM EST
auctioneer Tylan $21000 (end-auction 77433) 2:07 PM EST
auctioneer ottar $39000 (auction-overage 77433) 2:07 PM EST
ottar auctioneer $60000 (bid 77433)
And here's a transfer log of me giving Tylan the $39k he got shorted:
ottar Tylan $39000 -- see my forum thread 2:22 PM EST