About 24 government vehicles were returned following a Supreme Court order last month.
They belonged to former King Gyanendra – overthrown in 2008 when the monarchy was abolished – as well as several former prime ministers and ministers.
The deluxe fleet is currently gathering dust in government-run garages.
Officials say the authorities failed to prepare contingency plans for their handover to the state.
The vehicles must remain parked because no laws have been passed stipulating what should be done with them, they say.
The vehicles include expensive SUVs, Land Cruisers, Prados and Pajeros. But the cream of the fleet is a Mercedes Benz car used by former King Gyanendra.
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