In one case a shotgun and ammunition were taken from a hunter in a maimai beside a pond who had seven boxes of lead ammunition and 53 loose rounds.
In another incident rangers came across a maimai containing four people with four guns, even though one claimed he wasn't shooting.
"It is an offence for a hunter to have two guns ready to fire, or else one of those hunters was shooting without a licence," Mr Klee said.
"Either way ... an offence was being committed and the old excuse of 'I have a spare gun in case one stops working' just doesn't wash. If you must have a spare gun, it needs to be in a non-useable state in a gun case at the back of the maimai."
The game bird season opened on Saturday morning and runs for six weeks for dabbling ducks and later for some other species.
Mr Klee said as always a "small minority" were breaking the rules.
"We are talking about 95-plus per cent of hunters who are happily complying with the rules and regulations. We found hunters who were nearing their bag limits but none who were over."