How do I make it so when a brick is touched an item is removed from the inv?

I'm trying to make it so a player can grab a box and bring it to a destination.. (I'm a noob to scripting) I would like to add "1" to a NumberValue when a box is delivered (I'd also like to remove the Box from the inventory after touch) this is what I have:

local debounce = false

script.Parent.Touched:Connect(function(hit)
	if not debounce then
		debounce = true
		local plr = game:GetService("Players"):GetPlayerFromCharacter(hit.Parent)
		if plr then
			local holders = {plr:FindFirstChild("Backpack"), plr:FindFirstChild("StarterGear"), hit.Parent}
			game.Workspace.itemStocks.numberofSoap = game.Workspace.itemStocks.numberofSoap + 1
			for i,v in pairs(holders) do
				pcall(function()
					for i,v in pairs(v:GetChildren()) do
						if v:IsA("BackpackItem") then
							v:Destroy()
						end
					end
				end)
			end
		end
		wait(60)
		debounce = false
	end
end)

However I get an error in the output saying "20:47:44.955 - Workspace.End.Script:10: attempt to perform arithmetic on field 'numberofSoap' (a userdata value)"

You need to add ".Value" so, it will look like this:

game.Workspace.itemStocks.numberofSoap.Value = game.Workspace.itemStocks.numberofSoap.Value + 1

Paste this into line 9. Have fun scripting!