How do I make this work with filtering enabled on?

I'm trying to make it so that you need an item for something to appear so I made this script it works just fine with filtering enabled off but does not work with filtering enabled on how do I get this to work with filtering enabled on?

local MoveC1 = game.Workspace.CelebiMove1.Position
local MoveC2 = game.Workspace.CelebiMove2.Position

script.Parent.Touched:connect(function(hit) 
    local player = game.Players[hit.Parent.Name]
    if player.Backpack.GSBall then
        workspace.Celebi:MoveTo(MoveC1)
        wait(15)
        workspace.Celebi:MoveTo(MoveC2)
    end
end)