Post up details of the Coo on the leg. If it's No Coo
1 line = PBP / Euro / Lili Ledy ; 2 line = Tri Logo
http://swspaceclub.com/wbobafett/coo-guide-3-0/anh/stormtrooper/#a
I think it'll just be Tri Logo though as the Ledy trooper has a wider mouthpiece and normally have one of the pegs in the feet filled in. The pbp trooper helmet usually looks more unusual than that.
http://www.imperialgunneryforum.com/t2135p660-the-lili-ledy-guide-discussion-thread-part-1#Stormtrooper