OP – bad luck, hope you get it back or at least don’t get the run around from your insurers.
Onceinalifetime – sometimes its better to let people think you’re an idiot than open your mouth and confirm it.
Top tips from me… Cable ties – (big buggers) on the wheels, frame etc. stops chancers simply undoing the straps and walking off with your pride and joy. A lock is better for the more determined tea leaf that you might find in a motorway service station or other car park. I use a tow bar rack and I cover the bikes with an old motorbike cover and copious bungee cord, so that people can’t see that the rack and it’s contents are worth more than the car it’s attached to. It’s also worth noting that people can also simply remove most racks with either a spanner or flat bladed screwdriver so it is also worth securing your rack to the vehicle as well as the bikes that are on it.