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Hidden away in a storage room beneath Maz Kanata's Castle, Rey finds Luke's first / Anakin's second lightsaber
We last saw that weapon when Luke's hand was severed on cloud city, causing the hand and lightsaber to fall down the same chasm Luke later falls down.
How did it get from where we saw it last to eventually end up in Maz Kanata's Castle?
We don't know.
As commented above, she explicitly evades this question from Han in the movie.
We do know from Empire that Luke's hand was cut off and the light saber was presumably intact, simply lost somewhere in Cloud City or perhaps even Bespin. The original trilogy's protagonists were too busy trying to escape the empire to go back and look for it. It's possible Vader had a few storm troopers search it out and Maz got it from his possessions, but for now, this falls squarely into the category of information that we are not meant to know at this time.
It couldn't have been lost on Bespin because Bespin is a gaseous planet that only has a thin stratum of habitable atmosphere. It would have to be recovered from somewhere in Cloud City. It would have just been destroyed if it had fallen into the planet.
My theory:- maz had a vision that a new jedi would arrive and claim lukes light saber in order to bring peace to the galaxy. Because of this, maz used her connections to find the saber and keep it safe away from the the dark side. Rey turned up and felt the force calling to her. However maz was not to know that Rey would refuse to take it.
