As far as transporting, Harry has a magical chest that contains entire rooms and can walk on its own. Dumbledore, Quirrel, or any bribeable adult wizard can teleport him to gringotts or to any muggle bank or jeweler he would like to go to, and there are definitely spells for swiftly transporting items across a room or whatever. I think by far a bigger problem would be getting any muggle bank to accept 17 tons of silver in a single transaction without any sort of possible background checks.
Luckily, there are magical methods. Confundus charm, say, or the Imperius curse. (Yes, that does have the downside of being unethical, so Harry probably would not do it.)
As far as transporting, Harry has a magical chest that contains entire rooms and can walk on its own. Dumbledore, Quirrel, or any bribeable adult wizard can teleport him to gringotts or to any muggle bank or jeweler he would like to go to, and there are definitely spells for swiftly transporting items across a room or whatever. I think by far a bigger problem would be getting any muggle bank to accept 17 tons of silver in a single transaction without any sort of possible background checks.
Luckily, there are magical methods. Confundus charm, say, or the Imperius curse. (Yes, that does have the downside of being unethical, so Harry probably would not do it.)