Why is the script not buying the item?

Hi guys. this script is meant to buy some items for the player. I clicked on the gui, and I saw "Clicked" in the output (as expected). What is confusing me is why it is not buying it even though all the requirements are fulfilled (FPoints value is 5 or more, "Cardboard" boolean is set to false which means that the boolean is also present). No output errors or warnings occurred. The output did not print "checked", therefore it also will not print "saved". Here's the script:

The location of this script is in StarterGui (game.StarterGui.Script or game.Players.PlayerName.PlayerGui.Script)

player = script.Parent.Parent
function Check(Price)
    ls = player.leaderstats.FPoints
    if ls.Value >= Price then return true end
end
function Buy(Price)
    ls.Value = ls.Value-Price
end
if not player:FindFirstChild("Cardboard") then
    Cardboard = Instance.new("BoolValue",player)
    Cardboard.Name = "Cardboard"
    Cardboard.Value = false         end
gui = game.Workspace.Lobby.shopwall.SurfaceGui.Frame
gui.Cardboard.MouseButton1Click:connect(function()
    print("Clicked")
    if Cardboard ~= nil and Cardboard.Value == false and Check(5) then
        print("checked") Cardboard.Value = true Buy(5) print("Bought")
        DSS:SetAsync("Cardboard",true) print("Saved")
    end
end)