Can’t open supply chest if your wallet is full
I have all the keys for the supply chests, but I can’t open the last one to complete the area because when I first tried to open it my wallet was full. So I went and spent some money, but now it won’t let me open it again…I’m assuming because it thinks I used that last key.

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James Granger commented
Just wanted to say a couple of things here. First off the theory that the chest won’t open as your wallet is too full might have been spot on. I went and spent a bunch of my money on PSI Core’s and after getting my funds down to about 4,000… went back and the chest unlocked without a doubt. I would say that if that doesn’t work then I wouldn’t know the answer but it seemed to work for me. Maybe just needed to get rid of some more Psitanium.
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Anonymous commented
This could possibly be the reason I can't open my last supply chest in the game. Full wallet also. Inventory shows that I have a key, but the last supply chest (in Nerve Center, for me) is locked. Have tried going back to complete other things then coming back to the chest, leaving area and closing game then going back, etc. Can't open it.