I have done a few pricing shifts, but I asked my pricing friend for their answer...
So, when you scan an item that comes up salvage, you type in how many you have and then whichever device you are using will ask what you are doing with it, so you press Salvage. Next, you keep collecting salvage until your shift is over. We keep a box in our carts but you can also box it up later. When it's time to clean up, slap a green Salvage sticker on it and either store it for more tomorrow or tape it up and take it to receiving where they have a pallet to collect it.
Ps. Keep your eye out for good boxes, you'll need them! 🙂