Was doing a lost sector on the cosmodrome to insert siva. When I opened the chest I got 2 rewards and one was something along the lines of Winterbreak or something. Looked like it could have been a momento of some sort, but nothing in my consumables and nothing at postmaster. Did not screen shot it...
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Check your quests to see if you have 'Taming the Storm', good chance you just did the 'Complete Exodus Garden 2A' step of it.