There is nothing anywhere to show when your vehicle entered Austria - presumably you used a road border which, as you found out, is non-existant apart from a sign saying Austria! The same all across Europe - the only exception being UK to France where all they look at is Passports as you entered the Schengen Area.
In your position, knowing how things are in UK, and presumably the same throughout the EU, I would just return, ensure insurance is still in place, and carry on with your plans unaltered!
If you are near a border it might be an idea to drive/ride across from time to time and get some proof of the vehicle being out of the country, such as a petrol receipt. A parking ticket even proves the actual vehicle went!!!!
The EU is not a country and as much as it likes to impose things everyhere, traffic laws and regulations are still left to individual countries and outside their control and 'harmonisation' - so far!!
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