did u inform the bank about such loss?
any FIR or DDR in this context with police?
whether the account was closed or inoperative? If it was closed then how the bank gave report of insufficient funds?
any financial transaction with the person who presented the cheques?
serial no.s and dates (if any) will be relevant factors.
u may approach police and try to get FIR registered but keep in mind merely registration of FIR will not protect your interest....the police may cancel the FIR if they find no substance in your allegations.