I signed up with https://bikelinc.com.au tonight. We have five bikes for our family of 4 and I managed to find the serial numbers and receipts for all of them!
It's free to sign up and fairly straight-forward.
From the site:
Connect to protect your bike
Over 65,000 bikes are listed.
Is yours one of them?
Whether you ride a bike, scooter, dirt bike, skateboard or unicycle, join our free, award-winning Bikelinc network.
Police and the community can help return your bike or e-rideable to you if it’s lost or stolen.
Bikelinc is powered by Crime Stoppers WA and used in Western Australia, Australian Capital Territory and Tasmania.
