That's quite a common scam I'm afraid. There is/was loads of "reasonably priced" Harley Davidsons, Porsches, etc, etc on Gum Tree. The basic scam is that you had to pay first to "release" the item from some shipping yard or secure compound or whatever but viewing is NEVER an option. They always insist on payment via bank transfer, money bookers, western union, etc, etc. If it was genuine, the seller would have been more than happy to accept cash on collection as it saves him/her the hassle of shipping it. The fact it was a short auction just makes this fish even more fishy.

So well done on avoiding these scammers!!