Kohberger, 28, is accused of breaking into a rental home near the university campus in Moscow in the early hours of November 13 and fatally stabbing Kaylee Goncalves, 21, Madison Mogen, 21, Xana Kernodle, 20, and Ethan Chapin, 20.

Kohberger, then a graduate student at Washington State University, was arrested at his parents' home in Albrightsville, Pennsylvania, on December 30.

NEWSWEEK NEWSLETTER SIGN-UP >He has yet to enter a plea to four counts of first-degree murder and one count of felony burglary but a lawyer who represented him in Pennsylvania prior to his extradition to Idaho said he was "eager to be exonerated." 

According to court documents unsealed last month, ID cards inside a glove inside a box were among the items police seized during a search of Kohberger's parents' home in Albrightsville.

NewsNation reported that an ID connected to someone from the home where the slayings took place was found during a search.

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In an appearance on NewsNation, former FBI agent Jennifer Coffindaffer said the ID in question was found concealed inside a glove in a box.

"If you go to the search warrant return, sure enough, there are these IDs that were concealed in a glove in a box," she said.

"Now, this is just unusual. Most people don't keep IDs hidden in this fashion. So to me it was something that certainly corroborated the source information and seems suspect from the beginning."

Coffindaffer said it's not clear who the ID card belonged to, but if it was one of the murder victims then it could be a smoking gun.

"If indeed, he had that ID in that glove, this is smoking," she said. "There is no reason to explain it other than he was in that house and took that during the commission of that crime."It's super strong... especially when you combine it with the sheath that was found next to Maddie Mogen with his DNA on the clasp." Coffindaffer has been contacted for further comment. A probable cause affidavit said DNA found on a knife sheath connected Kohberger to the crime through DNA from his father that was retrieved from trash outside the family's Albrightsville home.