I wouldn’t. Sometimes shit like this just happens.
Can you get one locally easily enough? Montreal has a Guzzi dealer surely? I’d just drop AFI a line and tell them and ask them to include another one in your next order. Order a couple of oil filters and air filters, a set of rocker cover gaskets and some tampons, maybe an alternator belt. They’re all things you’ll use soon enough and they can pop the gasket in with that.
AF1 seem to be good sorts and I’ve never had any issues with stuff I’ve ordered off them.