I feel I'm biased with afterwards wisdom but I would've argued the opposite with the boxes. The wants box would've been highly more suspicious for me as a trap. What we want is a dangerous proposition with many ways of being detrimental while what you need would've been the safe bet. His argument of getting some nuke is quite flawed as it's clear the 'system' has plans that involve him growing and as long as he's fulfilling the requirements of the system it's highly unlikely for it to kill him by giving him something that is a twin edged sword for his need.
QiuYin