You’re simply quoting what LE said. They have no obligation to be truthful.
An example of a routine follow-up is when they went to PF’s house that second time and were there briefly as opposed to two days for the primary search.
There is nothing routine about multiple agencies spending many hours (and it’s still going on) at a residence that is 700 square feet.
When they walked through the residence before, Clint was with them and they were relying on his familiarity with his sister to identify anything that might be amiss.
This is full-blown CSI, and it is arising, IMHO, from something they found elsewhere.