Police are appealing for information after a box of ashes was left outside Attleborough Police Station last year.
The contents of the three inch square box, in British racing green with a white lining left in September 2015, have been forensically tested and police believe the ashes are human remains.
A spokesperson for the police said no one has come forward to claim the ashes.
If the appeal is unanswered in the next two weeks, the ashes will be scattered at GreenAcres Woodland Burials in Colney.
If you have information contact police on 101.