LAUNCESTON police investigators are still appealing for information about the theft of 13 firearms from a house at Newnham on April 1, as Crime Stoppers Week targets firearms offences.
Sergeant Mike Gillies said the registered and correctly stored firearms - seven shotguns and six rifles - included a distinctive 16-gauge Henry Piper shotgun, which was rare.
"The fact that there are further firearms in the community, most likely in the hands of those who don't intend to use them legally, is of concern to police," he said.
"We have a really good success rate with firearms burglaries ... but obviously we don't get every firearm [back].
"Every single one on the streets illegally is a concern, let alone multiple firearms."
Sergeant Gillies urged legal gun owners not to advertise the fact their house contained firearms, to avoid becoming a target of theft.
Crime Stoppers Tasmania chairwoman Jill Taylor said specific information was being sought on who had illegal guns, and how they were being acquired, stored and used.
"We want to get illegal firearms out of our community so that they cannot be used in a terrible crime or a tragic accident, such as where a child might mistake a firearm for a toy," she said.
"We implore people who have any information, no matter how small it seems, about illegal and unregistered firearms to contact Crime Stoppers on 1800 333 000."