Five rooms at the Jet Park quarantine hotel have been damaged by recent guests.
In one of the rooms, staff found a hole drilled in the door, the curtain rod lowered and a hole in a double-glazed window.
The guest also damaged a chair, TV remote, telephone and alarm clock.
A MIQ spokesperson said four rooms had minor damage like torn curtains, stained carpets, a broken chair and children’s drawings on the walls.
It comes amid hundreds of community cases quarantined at the hotel.
MIQ co-head Brigadier Rose King said returnees have months to prepare for their stay at MIQ, but community cases of Covid-19 are under short-term quarantine.
She said of course it can be “incredibly stressful” when they’re rearranging their lives.
“We recognize the additional stress experienced by members of our community who unexpectedly need to enter quarantine facilities,” she said.
King did not say if there were any repercussions for guests, but said any misbehavior by people at MIQ facilities is taken very seriously.
“We actively encourage staff to voice any concerns they may have, whether related to safety or other issues.”
She said security at the site was provided by police officers, Defense Force personnel and the Aviation Security Service, working alongside private security guards.