rare BURP piece?

vatilomi · 2016-05-05T15:23:36.000Z

Hello, does anybody have a idea from which set these pieces are? i know that this is; Rock Panel Rectangular (BURP) piece; 6082 but the color is dark bluish grey with dark green mixed and i can't seem to find this in any set. Thanks in advance... Sincerely Bricksatsea