[Iscool]

When they remove the shotgun, the officer handles it first to make sure that it is unloaded and safe to hand over to the crime scene techs. He does no such thing for the second object, letting the tech reach it and pick it up himself. That indicates the second object was not a firearm.

However, the video cuts in while the clearing of the weapon is in process...Had the other object been a weapon, it may have already been cleared...

I've owned a number of cloth cases of varying types...It just doesn't look like a case to me...

[Boogieman]

Well, the early part of the video from the other direction has a good shot of the trunk from overhead, illuminated by flashlight, and there is only one weapon visible. Also, the object the second tech pulls out of the trunk appears to flop around, which a rifle just doesn’t do.