A man forgot he had £800 in cash with him when he went to buy a train ticket.
He left it behind at the ticket office window and went back to his car, parked nearby.
He realised what he had done and immediately went back to the booking hall at Shoreham station.
The cash, which had been in a white envelope hidden inside a large desk diary, had gone but the diary was still where he had left it.
Shoreham police have appealed for anyone with information to contact them on 0845 6070999.
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