Cash, keys and a CCTV system were all taken during a burglary of a betting shop in Chadwell Heath.
The William Hill Bookmakers in High Road was locked by staff at 10.15pm on Sunday and when they returned the next morning at 7.30am they made the discovery.
The front door had been forced open.
Anyone with information should contact Ilford police on 020 8345 2680 or, if you wish to remain anonymous, Crimestoppers on 0800 555 111.
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