I can't imagine a seller would choose to use a more costly shipping method when they are only charging $5 for shipping. Ordinarily, I would expect the seller to ship via the method advertised. However, I've never heard of someone complaining about a seller upgrading the method at their expense. I'd recommend waiting until the last day of the estimated delivery period before being too concerned.
I'm assuming that the seller didn't attempt to increase the shipping charge to you?!
"It is an intelligent man that is aware of his own ignorance."
