50K contract OKCOIN futures trader, long or short?

Anyone curious whether the 50779 contract trader is a long or short on OKcoin futs? He is long. Here is the open interest and top traders

He had 50799 contracts before, now he holds 38416 after expiration. So that means he held 38K in quarterlies and 12K in weeklies. Can't be next week's because total open interest is less than his holding.

His 12K weekly was force liquidated just before expiry which indicated he was long. 12383+38416=50779

2015-07-31 15:04:18 Close Long 12,383Cont≈฿4,445.0427 $278.58