I used to drive for Hallmark in 2010 and several times had to take crew up to the American Embassy to get their visas... usually Pink or Blue flight deck crew.
We always had them leave anything that remotely looked like a phone, pad, computer or key fob with us whilst they went in. I would then pop off down the road to an amazing cafe for a full breakfast for only 1.99 and wait for them with the items on me.