There are two ways to get Lockbox Keys in Marathon. You can either: Between these two methods, you’ll likely find more Lockbox Keys than you can buy. Not only is the upgrade 2,500 Credits, but the ...
Crack open the caches.
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Where to use lockbox keys in Marathon
Lockbox Keys in Marathon unlock special loot rooms marked by red flares. Here’s how to get them and where to use them.
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