2011 Chev Tahoe center storage console box.

[dlj3096]

Somewhere under the big center storage console box, something is rolling around. I took the top of the coffee holder area off and looked around but the sound seems to be below the main box area. How do I take off the big main storage box. Looks like 4 screws in bottom of box and 4 around top of frame of storage box. Two screws are located under the dash area and do not know how to remove them if I have to. Any suggestions?? Loose screw or whatever if driving me nuts. Thanks. Dennis