You only can get one per day and you pick it up from the post master.
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I know. But you're also supposed to get a reward for any gold-tier ratings, immediately after completing the event.
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Read your link again lol. Players "sometimes" get a reward instantly after gold tier, not every time.
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Read my link again. "Guardians are rewarded with Glimmer, experience, and sometimes a rare material for Gold-Tier ratings, which are rewarded instantly."