Sach,
you seem to be unfamiliar with the rules.
If you do not have a permit, you are not allowed to enter QDC,
Your friend that sold you the alcohol would have got into trouble with the old rules. However, now only the person holding the items are in trouble.
Your friend was being good to you. He is not supposed to sell or distribute the alcohol, it is from his personal consumption and has to take it home immediately from QDC. Do not put your friend in trouble, if QDC comes to know about it, they will terminate his licence.
He is at fault for giving you a receipt, it incriminates him. Good the Police did not want to see the receipt.
Enough said on this topic.