I would (naively) assume that with Amazon as the supplier of record, you would be safe.
By supplier, I meant to imply the scenario where you went online, through maybe eBay, and picked an item without paying attention to where they shipped from. I've done that and received stuff direct from SouthEast Asia, and it was okay, but it dud make me concerned enough that I didn't leave the power supply plugged in and unattended.
Amazon, even if it is a third party seller, has some reasonable assurance behind it. I think...again, I could be fooling myself.