You are right. Those coins landed in Labcoin's wallet, but we don't know when they were mined. Labcoin set their threshold for hourly payouts to .05 BTC and the other transactions you have spotted were probably a surplus which was manually (?) pushed. Some days ago they were visible in the team ranking under the name "labcoin", but I didn't saw them in the last hours. This means their hashrate never exceeded approximately 680 GH/s or those weren't mined under the team banner "labcoin".