Police were investigating the deaths as suspected overdoses but no official cause had yet been determined.
A day after the deaths,Queensland Premier Annastacia Palaszczuk announced a Department of Health officialwould travel to the ACTto examine the territory's pill testing trial.
The organisers of the music festival had their permitcancelled by NSW police last year over site safety risks and fears regarding drug-taking.
In a statement,festival management said professional paramedics worked 24 hours during the festival and an on-call doctor had been onsite.
They added that Queensland police and Queensland ambulance staff were on duty in a user-pay capacity during the festival.
"All of the staff and community at Rabbits Eat Lettuce would like to pass on our sincerest condolences to the family and friends of those who were found deceased,"it read.