First things first, welcome Alvinqk (can see this is your first
post here).
I think it's better you let us know whats your intention for the
knife. And well, I hope you're above 18yrs old too.
Basically, the gist is, if your knife/weapon does indeed get
impounded, it'll head to Cantonment Police HQ Arms and Explosives
Division. You'll have to call them to check if the item is in
possession and basically they'll guide you from there. It's quite
straight-forward if you're on the right side of the law.