Tom

Ebay is a mix of sellers, some businesses which tend to do things like confirm everything immediately, some are individuals either with a sideline, or simply selling personal stuff. With individuals, you need to be a bit more patient, since they're all different, and if just doing it part time, can be a bit unresponsive for a day or two.

Also consider that there's been some bad weather, and if you bought from someone in the northeast, they might be without power, phone, and/or the internet.

So, there's time to protect yourself, and your position doesn't get worse for a while yet, so I'd give it a bit more time before starting a case. That's unless the seller is a business in an area not affected by winter storms.