Officers in Dumfries have taken to social media urging the owner to "pop in, tell us what's inside" and claim it.
BMW Windscreen Damaged By Man Hanging Van On M9
A BMW has been damaged after a man struck the windscreen while hanging out of the window of a van on a busy stretch of road.
The incident happened at about 10am on Tuesday on the M9 near junction four and Linlithgow Loch, heading towards Edinburgh.
A male passenger in a white van hung out the window and struck the windscreen of a white BMW 1 Series, police said.
Sergeant Andrew McGhee added: "We're appealing for anyone who might have witnessed this incident to please contact us.
"The M9 is a busy stretch of road and we're sure someone would have seen this.''
Anyone with information can contact police on 101 or anonymously via Crimestoppers on 0800 555 111.
Scotland's deficit fell to £13.3 billion for 2016/17 amid an increase in oil and gas revenues, according to new figures.
A man has been arrested after a teenager was allegedly seriously sexually assaulted in a vehicle which she got into thinking it was a taxi.
Emergency services were called to the scene in Renton Road in Dumbarton following the crash which happened at about 8.40am.
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