As a rule, Gerber and ODB++ files are not provided to customers, because the files contain proprietary information about our design and could be used to mass-produce our product without our consent.
There is normally no reason that a customer would need Gerber files. Gerber files are provided to PCB manufacturers to mass-produce PCBs. IBIS, EBD, or board files provide enough information for customers to create models and perform signal integrity simulations.