I think the more likely scenario is that he comes from a country in which cell phones are expensive. If the phone is GSM capable such as T-Mobile phones he can buy 60K worth of phones, take them back to whatever country he is from and sell them on the open market for 2 to 3 times what he paid. While this needs to be investigated my guess is it's about money and not about terrorism.
Perhaps the person was buying them for the people who live in Omaha NE.
http://www.ketv.com/news/4431759/detail.html