think they open for check-in ~3hr before a flight at outport.

Tried to check-in at 1330 for QR2 the other week, very busy every flight overbooked. Flight supervisor offered to get me on QR4. Said no, ended up with an op-up.

Back to topic. The lady at the desk was initially reluctant since they were very busy (all the overbooking). If so, tell them you have done this before, you are willing to drop your bag at D27 and would like to get to the lounge and chill. She got her senior around after a few calls they said yes.

Act like you're staff and know what you're talking about (i've done this 3 times prior to this on a quieter day). Smile and be nice and have a good bant with them and you're set. You just have to take your bag somewhere else after weighing and tagging, nothing major.