Me and a friend started the lost and found quest at the same time. We also happened to be doing court of oryx. The quest completes. We turned it in, he got the boolean and i didnt. Only difference is im not rank 3. Sucks because there is no good way to lvl up.
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You have to be rank 3 before you will get it.
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I'm thinking the trick is to complete all the Reef quests until one of them awards the Scout Rifle, and I think which one awards it is random. So get Wolves of Mars done, or any other Reef quest lines you have.