If you read what the two officers wrote, sentences 1 and 2 of what each allegedly wrote are identical. Then sentence 3 for each is completely different. And there is a third version of the story where the sheath was half under MM and half under the blanket. If it was half under her, it would not be lying beside her right side. So, right there, this looks very questionable. Where exactly was the sheath when it was found and who found it?
Yes, sentence 3 was different because they each had slightly different experiences. The investigators were not attached to the hip. One apparently saw the bloody sheath at the crime scene later and the other was told about it later. I don't see that as a problem.
They were looking at two brutally stabbed young girls. I am sure it was bloody and gruesome. And there were 2 other dead bodies to take in as well that day. They may have processed the experience in slightly different ways.
Who cares if one says half under blanket /half under body and the others say 'under' the body? Both of the things can be true. Just worded differently.
And besides----there are many pictures that will show exactly how it was found. So the exact way one officer describes it vs another does not matter in the end. One mentions the blanket while another doesn't. I don't see the problem. Obviously there are going to be blankets, they were found in bed.
"Where exactly was the sheath when it was found and who found it?"
I think that has been answered pretty clearly. The sheath was found at the crime scene, in the bed where the 2 dead girls were found. It was right there, partly covered by a blanket and one of the bodies.
The crime scene investigators found it when they began processing the scene. At that point they likely pointed it out to which ever detectives were still on the scene at that time.
The way you asked it above, makes it sound like there is some huge discrepancy about it's location and its discovery. It's not like it was found when the family came to pick up the deceased's belongings or by the cleaning crew weeks later.