There is a chest that sits on top of a locker in the left server room when looking at the Particle Accelerator in Archer's line that will not give a prompt to open. In that same corner, there seems to be an invisible wall preventing you for walking into that corner and might have to do with the being unable to open the chest.
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I've run into that one several times. At first i just thought it was a fluke but it's the same every time that chest spawns.