Police have warned shooters, horse riders and members of the general public to stop entering blue gum plantations or face prosecution.
Macarthur police Senior Constable David Rook said he had received a number of reports from plantation owners and managers about trespassers.
"There have been a number of reports, a couple in the past week," he said.
"People are going onto private property when they have no right to do so, particularly in the Bessiebelle area to hunt deer.
"They have no permission and it's illegal to enter those properties."
Senior Constable Rook said that generally blue gum plantation owners denied entry onto their properties to everyone except professional vermin cullers.
"People don't realise that they face a police investigation and a potential charge of entering a private place without permission," he said.
"If they are shooters carrying guns then there could be other charges such as carrying a firearm on private property.
"People are being detected and asked to leave. One person challenged in blue gums said he thought it was crown land. It's a bit bewildering."
The highly experienced rural police officer said those charged would go to court.
"You will be investigated and if charged will go to court for a hearing, facing the potential loss of your firearms licence and your guns," Senior Constable Rook said.
"People are just not thinking about what they are doing and what they are risking.
"Would you like someone carrying a firearm walking on to your property? It's ridiculous."
Senior Constable Rook said he was in the process of investigating the two recent complaints.
"The message is simple - Don't go onto blue gum plantation properties. They are not there for you," he said.
"It's privately owned farmland. I would also encourage anyone who sees someone in blue gum plantations to immediately contact your local police station.
"We're not just talking about shooters, it's people walking their dogs and riding horses. Members of the public should stay off private property or they face prosecution.
"I find it harm to fathom. It's someone else's property and entering denies any rationale," he said.
Have you signed up to The Standard's daily newsletter and breaking news emails? You can register below and make sure you are up to date with everything that's happening in the south-west.