Confiscation of property due to unsubstantiated assets

I read news about a case where a Land Rover car, registered to a civil servant's daughter, was confiscated because the court considered it an unsubstantiated asset – allegedly the real user was the father, who could not prove the legal origin of the money for the purchase. A question arose: if, for example, a family member buys an expensive item, and I use it, can it be recognized as an unsubstantiated asset and confiscated if we don't have clear evidence of the legal origin of the money? How can I protect myself from such a situation to avoid losing property?