You need to destroy the Prime Servitor then Petra will have the weapon.
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Some people have gotten it only from doing 'Lost and Found.' Those people are lucky haha!
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Proof?
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http://youtu.be/7DQYHEqa25k Also, I say the proof is in all the people saying my friend got it from the 'Lost and Found' quest, but I didn't. It's too genuine of a comment for many different people to maliciously post it over and over again.