I'll make it easy for you - 90% of satchels and stamps on ebay are counterfeit or stolen or washed with chemicals to remove inking. All three of these things net 90% profits to the seller. If you want authentic buy from Australia Post only. If you want to save 15% use sendle and compare prices. Satchels are purchased from A>L.I B$A(B$A for 1 cent each. Your money is going to criminals.