Extending an auction is against the rules (see section 3.c., Auctions). Whoever gave the highest bid by the original deadline (Trispanner, I think?) should receive the prize.
The Rules - 3.c. Auctions said:
Increasing or decreasing auction time is not allowed by default. It is considered a special right and must be reserved in the auctioneer's original post before bidding begins.
Extending an auction is against the rules (see section 3.c., Auctions). Whoever gave the highest bid by the original deadline (Trispanner, I think?) should receive the prize.