identify at least two clues ascertained by detective nye after his interview with Mr. and Mrs. Hickocks.

The detective sees a .12-gauge Savage shotgun, Model 300 that he thinks was used in the murder. Here's a quote of the other detail.

“Now, I’ll just run through this, see if I have it straight. Perry Smith arrived in Kansas Thursday, the twelfth of November. Your son claimed this person came here to collect a sum of money from a sister residing in Fort Scott. That Saturday the two drove to Fort Scott, where they remained overnight—I assume in the home of the sister?”

Mr. Hickock said, “No. They never could find her. Seems like she’d moved.”