Various vehicles, parked in Lexden Drive and near to Pitt Drive were left unlocked on Monday, making it easy for thieves to steal cash from inside them.
It is thought that the thefts were committed in the early hours of Monday morning (5th February). Sergeant Stuart Mullins, part of the Lewes district prevention team, implored owners to be on their guard.
He said: “Most of the vehicles entered were insecure and I would urge all owners to lock their vehicles and shut all windows when leaving them unattended.
“This applies even when they are left on private driveways or in private car parks, and even if left for only a few minutes.”
Sergeant Mullins also stressed the importance of removing anything of value from vehicles before leaving them.
Anyone seeing any suspicious activity around vans and cars, or who has information about the recent incidents, is asked to contact police online or phone 101, quoting serial 74 of 05/02.
If a crime is in progress or appears imminent, please call 999 immediately and ask for police.