"New in the wrap" Bren mags and tin.

I wouldn't expect the dealers to know what's going on as it appears the Government have no idea either.

I recently picked up this sealed in plastic Bren mag at a militaria show and while the mag may not be new old stock, I thought that it would be interesting to know which country's military may have wrapped it in this manner. Does anyone recognise this method of wrapping/storing Bren mags, please? The vendor did have several Australian Bren bits and bobs on his stall so it could, possibly, be Australian? Thanks for any information.