"When dealing with a demon of Lilith's caliber, it's best to use every resource at your disposal. A prophet is one of the most useful tools of the Lord."
Those were Castiel's exact words and only explanation before sending Sam and Dean packing it to this town. Buttfuck nowhere, USA. Population: less than a thousand.
So it's hard for them to pull their usual shtick of rolling up with shiny FBI badges and brushing off questions. Everyone knows everyone here, so they need a good excuse.
"We're roadtrippers." Is the first thing that comes out of Dean's mouth while talking to the local pastor. "Me and little brother here." He gives Sam a firm pat on the shoulder, a solid Do not contradict me right now.
"And we're looking for anything strange. It's sort of our thing, for our... blog. You see anything? Anyone?"