When I was playing yesterday, I thought it was April fools.
The first time was on the moon, close to this yellow glowing thing. I killed a knight, and he dropped an exotic box. It was uncommon. I thought it was like that because of the yellow light, and didn't blame anyone.
On venus: same problem after killing a vandal. I began to question the date, and the question if I hadn't played for a straight month.
On mars exactly the same problem, but 7 times or so. I started to think bungie was trying to troll me, and succeeding every time. Why??????
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Only way Exotic Engrams can drop is if you kill an Ultra while you have the Three of Coins buff. Regular enemies do not drop Exotic Engrams.