"In the courtroom, which was closed to cameras,
prosecutors reportedly said that a small amount of evidence previously believed to be significant was no longer considered critical to the investigation."
From (also can be found in other sources)
Prosecutors in Kelsey Berreth murder case say evidence set for testing is no longer critical to the investigation
I don't think this is some piece of evidence from the fire pit (oh how awesome that would be) and if it is they must then doubt it is hers. I have my opinions of why they changed their tune in January (above date) as to its importance and I do not believe it was found in the burn pit. I think the reason they were no longer so gung ho about it is otherwise.
Jmo though.