Originally Posted by
tpblue
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Yeah I was in co op for most of them and killed all of them the proper way, but Midas or the other guy that spawns with him didn't drop a key so I'm sitting at 6 of 8 right now but all masks dropped. And if it makes a difference I did ghost and spectre the proper way the first time I never did it via the one shot kill thing so I got both those keys no problem.
Also I see the post above saying he killed them many times since but I can't even get any of them to spawn again.