The cube sequence doesn't make sense to me.
What kind of guard will let a cube not pass through the system like that? If I were that guard I would find that cube throw highly suspicious.
And while we are at it, wouldn't it be easier to hide the microSD card under the tongue for example?
And lastly, where exactly are you supposed to stick that card into in the facility? Even low-level security companies glue all USB/card reader inputs.