If KB's phone was mailed or shipped to Idaho, I doubt it travelled by truck. USPS ships in the cargo of commercial airliners and freight planes, and FedEx has their own planes.
If someone else had possession of KB's phone, posters have explained upthread about prescheduling texts. Thursday 22nd was Thanksgiving, so no shipping. Someone could fully charge the battery, schedule the texts for Sunday 25th. On Friday the 23rd simply ship the phone to Idaho from Colorado Springs with guaranteed delivery overnight or 2-day. The phone battery should last 48 hours if it is just left on and not doing anything - Friday 23rd to Sunday 25th.
Then the phone battery dies by Monday 26th in the package with a likely undeliverable Idaho address. It's in a warehouse somewhere, or even returned to sender, which may or may not be a real address in Colorado. Someone could effectively ship it to themself and who would know.