A fellow user and friend of mine found this mysterious coin in the first mission of the House of Wolves DLC (A Kell Rising).
To protect the secret, I won't reveal the exact location, but since I was a part of the Halo 4 Easteregg Hunter team, my curious heart burns again with questions.
I wonder, are there more? In every HoW mission, or only a select few? Do they have a use, or are they only simple eastereggs like the small coins in the Tower?
[spoiler]Do we get something if we find all?[/spoiler]
I already tried out a few things. You cannot move the coin, nor interact with them in any other way. Which leads me to believe that they are like the coins in the Tower. You cannot find the coin in the Archon Priest Strike, which makes me think that you cannot find them outside of House of Wolves missions.
Any cryptic words on this Bungie?
[b]EDIT[/b]: Since it's already publicy found on YouTube, I decided to share a video with you (not my video) from a person who already found TWO coins. Here it is:
https://youtu.be/8ST_FPNczWc
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I found another on the last mission on venus as well.