Make sure it’s brand new. It wouldn’t be the first time Apple repackages returned products and ships them out as new from inside the US. Rialto, CA might be one of their collection centers on the West coast, just like Carlisle, PA on the East coast.Interesting, my i5/16/1TB/Silver was ordered May 9th, today was both charged to my CC and shipped but according to UPS is shipping from Rialto, CA and not China. Also, Apple's original quote was May 27- June 4 delivery but since shipping this morning Apple is now saying May 21 for delivery.
If you have doubts about it, return it and order a new one. If you accept an exchange, the 14 days run from the first purchase and then you’re stuck in the repair cycle.