Here is my theory on what's in the guitar case: a guitar.
But not just any guitar, it's Charlie's guitar. In Season 1 Episode 7 The Moth, Locke shows Charlie his guitar sitting on a big hill after Charlie gives up his drugs. My theory is that Charlie's guitar may be caught in a time loop like Richard's compass. Maybe at some point, after Charlie's death, Jacob gets a hold of Charlie's guitar. He leaves the island, bringing the guitar with him. He then meets Hurley in a cab and gives him the guitar, knowing he will bring it back to the island. If after the Jughead explosion the Losties somehow end up back in 2004, Hurley could end up being the one who puts Charlie's guitar case on that hill, completing the cycle. It could be that Charlie's ghost tells him to out it there. Or maybe some form of Locke knows that the guitar is supposed to be there, so he istrcuts Hurley to do it.
This is the first theory I have posted here and I just thought of it but here you go.
But not just any guitar, it's Charlie's guitar. In Season 1 Episode 7 The Moth, Locke shows Charlie his guitar sitting on a big hill after Charlie gives up his drugs. My theory is that Charlie's guitar may be caught in a time loop like Richard's compass. Maybe at some point, after Charlie's death, Jacob gets a hold of Charlie's guitar. He leaves the island, bringing the guitar with him. He then meets Hurley in a cab and gives him the guitar, knowing he will bring it back to the island. If after the Jughead explosion the Losties somehow end up back in 2004, Hurley could end up being the one who puts Charlie's guitar case on that hill, completing the cycle. It could be that Charlie's ghost tells him to out it there. Or maybe some form of Locke knows that the guitar is supposed to be there, so he istrcuts Hurley to do it.
This is the first theory I have posted here and I just thought of it but here you go.