Arthur Mashaba, 43, and Albertus Muloti, 40, appeared on charges of the illegal possession of a firearm and ammunition on Monday, Colonel Ronel Otto said.
Charges against three other suspects were dropped because they could not be linked to the firearm and ammunition.
The case against Mashaba and Muloti was postponed to next Tuesday for further investigation. They would remain in custody. They were arrested on Friday evening after information was received about possible rhino poaching in the Marble Hall area.
After a tip-off police stopped and searched a car and a bakkie. The five were arrested. A hunting rifle, silencer, ammunition, and an axe were seized.