Undertsood. Lets up catch up during next ride and see what it is

@shibsk92 What exactly is causing the rattling ? The box or the top box mounting plate ? if its the plate ? how about some packing to fill the gaps if any ?

@shibsk92 - I hope you're locking the latch securely inside the box and tightening it properly. I've also noticed a slight amount of movement when I try to shake the box left and right after tightening it, but there hasn't been any rattling while riding.
If both your rack and top box are still under warranty, I'd recommend contacting the Royal Enfield service center to have them inspect it or file a warranty claim if necessary.

1.Nandu
2.Devan