I wonder if the delay expected in releasing the name of the deceased may not only to make sure no stone remains unturned but also to prepare for an arrest. That way rumors and stories may not be as derimental at that time.
I would think with the offensive strong odor that it was a body dumped not long before. Days not months. As well, as soon as police began to process the crime scene with the body all other searches ceased, that tells me sadly the body is Sonia. The road looks very similar to where the found...
Has anyone considered the perp would be out of sorts and may have exited the car then realizing he forgot to pop trunk so reached in via passenger door to do it. Quickly grab and go from trunk no time for worrying about doors or trunk.