Indeed. Put it in your own bag and you're good, I wouldn't trust a box filled with mobile phones. Someone is bound to take the wrong one home when they're done,

Indeed. Put it in your own bag and you're good, I wouldn't trust a box filled with mobile phones. Someone is bound to take the wrong one home when they're done, someone might even steal one. There is really no need to create that unnecessary stress when you're already writing an exam.