I just noticed something. At the end of season 3, right before the hellhounds come after Dean in No Rest for the Wicked, he’s wearing the Samulet.
And then at the beginning of Lazarus Rising, Sam is wearing it until he gives it back to Dean.
So he must have taken it off Dean before he had to bury him, right? BUT if you watch the very last shot of season 3 where Dean’s in hell…
Yep. There it is. At this time, Dean’s actual body was still lying back in the room where he died, so this is obviously his soul.
Dean’s soul wears the Samulet.