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3 locations for the Golden Moas, if anyone is interested:

Sierra 117:
Spoiler:
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Crows Nest:
Spoiler:
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Tsavo Highway
Spoiler:
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As 343 have stated, the spawns change weekly, and I'm not sure if everyone shares the same spawns each week - so apologies if they ain't there for you. Also, I stopped looking after I found the first Moa of each mission, so I'm not sure if there are multiple Moas per map.
Can confirm all 3 moas were there, Thanks!
Thanks
I found another one on crows nest. It’s in the area with the jet pack brutes up in the room with the invisibility on the floor.
There's another in Sierra 117 near the end. Right after the cutscene with Johnson being locked up, if you look across the map to the dam, there's a GM below the far end of the dam.

I got the 2 on S117, then finished up with the crowsnest one op mentioned.
Halo Canon has a video with all 3 Moa Statues found on each mission. I hope these guides are uploaded each week!