well, Star Wars God, ... you mastered the skill of reading, read this then please:
http://www.killermovies.com/forums/f5/t20463.html
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"...EU material is not considered valid material to be accepted for debate in the film sections." your book is EU.
If you wanted to point out that there aren't three sabres in Ben's place, a simple reference to the ROTJ novel (which is semi-canon) would have done the deal already where it is written that Luke makes his own sabre from spare parts he found