Question for TNT Express

Hi I will be coming to Kalgoorlie in a couple of weeks to do a stand at an exhibition after the exhibition I wanted to drop off the exhibition equipment boxes at the depot so I can fly out at 7 am the next morning.
My question is the exhibition finishes at 6pm is there any way i can drop the boxes off when the depot is closed or will I have to organise to have them picked up from the venue?