The one in the movie is ACU Camo not Multicam but the one sold by Spec-Ops is not quite accurate. The button snap should be on the outside showing, which if you get one from Spec-Ops they have snap button covered by the strap so it's slightly different. I believe the button snap on the outside is specifically made for Chris Reeve only now. I've seen a few older made Pacific knifes that did come with a sheath with the snaps covered but I don't believe they come like that anymore but that style isn't accurate anyway.
Also not really a big deal but some of the Pacific sheaths have the snap and rivets green and some come in black. Some even come with mismatch colors. I think it's just a matter of which production you get but going through pictures for the movie the sheaths they used have green snap buttons but still hard to tell if the rivets are also green or black.
http://i126.photobucket.com/albums/p108/xplay024/Mad Max Fury Road/Sheath detail_zps9kx6h0rk.jpg
I believe the Spec-Ops sheath here is for an 8" knife which is why it appears slightly longer compared to the one made for Chris Reeve, but you can see the difference between the button snap straps
http://i126.photobucket.com/albums/p108/xplay024/Mad Max Fury Road/Sheath compare_zps529wh5bm.jpg