Aww dammit. The time-out ate my post.
I've been back and forth from Wellington 4 times since September and they only really seem concerned about weapons on hand luggage (I saw an old man have his whisker scissors taken off him). But I've carried pills back and forth a couple of times on Domestic no worries. I didn't really expect any trouble though. I've never seen anyone actually searched on Domestic, even now.
Otherwise what Harv and J said with the obvious "don't look nervous" tacked on! I go with the "bored off my nut" look!
As a slight aside, I've noticed that the magnetic scanner thingy at AK Domestic is less senstive than the one in Welly. In AK, I walked through with my phone, keys and change and it didn't go off. In Welly, it picked up a five cent piece in my jacket pocket! How crazy is that?!