At the beginning of this case, it was reported that there were 3 to 8 strands of hair.
It was Keith who said this.
Unless we were being misled from the beginning, it doesn't sound like a "hank"
Keith confirms that a few strands of hair were found maybe between three and eight strands but says it wasnt a normal thing.http://people.com/crime/missing-sherri-papini-update-husband-keith-interview/
The missing poster describes her hair as being in a pony tail. This may have made it hard to pull out a larger amount.