WELCOME TO THE FORUM! lemme try and dissect this paragraph...
for new snakes, you should give them 5 days to a week to adjust to their new environment. that means no feeding, no handling, minimal enclosure check-ups. my newest girl took almost 3 weeks to adjust and start eating.
there is a HUGE difference between the size of an adult mouse and a small rat. are you sure you have those sizes correct?
this is false. most keepers feed rats due to their higher nutrient content. every now and then we see a snake who's a "mouser" but most keepers will try and get them to switch over to rats.
most people hit the head with a hairdryer to warm it up so the snake believes it's alive. also, if he was "eating really good" then i wouldn't worry about waiting for your feeders to come in.
he's probably still adjusting to his new environment. i'd give him more time to settle in (no handling), feed him in the next 5 to 7 days and you should start seeing strikes soon enough.