Hi does anyone know if:

1. original local store receipt for chanel bought here in singapore is credible enough to warranty its authencity? [serial number in bag matched receipt]

2. does chanel staffs assist to authenticate if we produce item with their original receipt? (bought 3-4 years back)

3. this original receipt is a store duplicate as an exchange was done (stamped with GOODS EXCHANGED). seller claims she brought the chanel boy of another leather type to exchange for the current caviar leather.

thanks and grateful for the advices!