How did Maz acquire the lightsaber?

This is yet another question for which we need to come up with our own answers (which may or may not be good). As we know, Maz Kanata (one of the most interesting characters of Star Wars: The Force Awakens) has lived a very long life, being something of a legend. So we can assume that, in her travels, she happened upon the lightsaber.

But this is a too easy explanation, a too unsatisfying one.

According to the original script, the movie was supposed to begin with the weapon falling onto a planet (which wasn’t Jakku). From here on, a rumor said that it was found and, through a series of unexpected events (several accidents, battles, and transactions) it ended up with Maz. But this explanation also seems too thin.

What happened after all and how did the lightsaber end up from the Cloud City unto an unknown planet and then with Maz? We have no idea – and even the rumored explanations seem too convenient.