A 32-year-old Canberra suspect appeared in ACT Magistrates Court on Tuesday to face several charges, including aggravated robbery and driving a stolen motor vehicle. He was denied bail, local media reported, citing court documents.

The Australian Broadcasting Corporation (ABC) has said the man pointed a long-barrelled gun at Kyrgios' mother Norlaila and demanded the keys to the green Tesla.

"Last couple days has been rough ... haven't slept much and battling a little," Kyrgios wrote on Instagram. "Appreciative of all the support."

In a statement on Thursday, ACT Police said they had seized a shotgun they believed was used in the incident as well as two other firearms.

"On the afternoon of Tuesday ... police executed a search warrant at a residence in Gilmore and located a shotgun, believed to be the firearm used during the robbery," the statement said.

World number 26 Kyrgios is yet to make his 2023 season debut after having knee surgery following his withdrawal from the Australian Open in January.