kingjj: [...] for all we know he's on a list as a suspected dodgy image traffickers ("objectionable material" covers all matter of sins) and the Snowden thing is a just a convenient excuse to force customs hand. [...]
I find it strange they would tell him nothing but they tell the media it was suspicion of objectionable material.
[Edit: My mistake. Customs later told him. From the original article: "However, a Customs official has since told him they were searching everything for objectionable material under the Films, Videos, and Publications Classification Act 1993."]
I looked up the NZ definition. It is very specific - to the point where he can potentially sue the crown for defamation if a public official outside parliament is saying that kind of thing and it is absolutely not true.
[Edit: As per edit above obviously there is no defamation if he already discussed that with media himself prior to any public comment from customs.]