WHAT BANK SHOULD DO WHEN A DEPOSITED CHEQUE DRAWN ON OVERSEAS BANK IS FOUND NOT GENUINE? WILL THEY RETURN ?

If a deposited coupon is found by a bank is not genuine what a bank will do? My subject is 1. will they lapse a instrument to a depositor after defacing it? 2. Will they Keep a instrument with them as well as only contend which it is not genuine?
What have been a instructions since to a landowner by a RBI in this courtesy as well as where it is referred to in a guideline of RBI or any alternative efficient authority?

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