... and show TRS that the sealed bag is still sealed.
I used to trawl the DF shops in Collins and Elizabeth Street looking for DF bargains, but can't remember seeing any there any more: they can't compete with the likes of JB Hifi and others. I guess the ones at thew airport still exist because they have a captive market, but their prices are not comnpetitive (well not on cameras, laptops or phones anyway).
Ok, I stand corrected.
I just did a google for DF in CBD Melbourne, according to Yellow Pages there's one dedicated DF shop - JR. All the others are retail stores (eg JB Hifi, Watches of Switzerland, etc.) JR Duty Free does have Moet & Chandon Reserve NV Duty-free exclusive 3x750ml for $169 duty free = $56 ea, which is about what I saw them in Costco and Dan Murphy's for.