It's believed the suspect was planning to sell the horn to a potential client who did not show up.
Community members adjacent to reserves are caught in the crossfire between poverty paying poachers.
The park says it often moves rhino to other parks at this time of year to stimulate growth.
Officials say one of the suspects was apprehended earlier today following a tip-off.
The US govt wants two SA brothers extradited for trying to sell rhino horns to American hunters.
The Czech Republic has become a major transit point for rhino horn trafficking in recent years.