Green border of the flag means it's a flag of the Border Guard.
As for their location: Decree of the Minister of Internal Affairs and Administration from 29th of july 1998 about flag and marking of ships and aircraft of the Border Guard, appendix 2.
http://www.abc.com.pl/serwis/gfx/318768866_0.gif
Though I may agree, that the "green" flag might perhaps be slightly too big.
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