I am going to be flying out of London through Heathrow, to Melbourne Australia on Royal Brunei soon. There are two stop overs - Dubai, which is a "refuelling" stop and Brunei, a 2 1/2 hour layover. I am intending to carry in my carry-on luggage 150oz of silver in rounds and about 3 oz in gold coins. That is roughly 4.5 Kgs, including a metal lockbox. That may sound like a trivial amount, but I am nevertheless nervous about airport security and customs inspections (and fellow passengers). I'm worried the coins will be confiscated at some security point or customs inspection for some reason, or even stolen aboard the plane. My understanding is that I do not need to declare the coins at any point, and I should ask for a private security screening when passing through security points. Do they ever ask questions like "What are all these coins, why are you carrying all these coins, are they yours, can you prove it"? Stuff like that. I don't have receipts or valuation certificates for anything. The flight leaving time and time zones are terrible, and a 27 hour flight time all up - I'm not a young buck any more and I'm worried I will fall asleep at some point leaving me vulnerable to theft. I think I'm OK once I get to Melbourne. I'm more worried about problems in London, Dubai and Brunei. I do not intend to leave the airport in Dubai and Brunei - I will be transiting between flights only. How should I go about this mission to ensure success? Any advice and suggestions will be gratefully accepted.