scratched discs here and there are inevitable because blu-rays get scratched easily.
Unless the scratches are etched onto the surface of the disc, consoles won’t have any problem reading them.
Maybe you can add a disclaimer while placing a sell order on your website, saying you’d deduct 100 Rs or 150 Rs if the disc is found to have scratches.
This would be much better instead of sending it back again, which is a waste of time and resources.
And you can sell those scratched discs at discounted rates by adding a new grading category.
This is kinda how BBTS (collectibles store in the US) sells items with damaged packaging for discounted rates and people still buy them coz they’re cheap.