I think I didn't received keys from bellow transactions, can you check for me?

Limit order transaction 18206 ($17.4 @ $227.96). (LIMIT_ORDER_SELL_RECV_18206) 2015-08-28 09:06 - 0.07632920
Limit order transaction 18215 ($17.4 @ $227.83). (LIMIT_ORDER_SELL_RECV_18215) 2015-08-28 09:18 - 0.07637270

You received them already.

He originally sold you 60 keys, but only 20 went through, as you see in these two transaction. If you check the bot's Steam inventory history, you should see that Dispenser 03 (Lv.1) sent you 60 keys, and later 40 were sent back.