User blog comment:FairyRaven/Fairy Tail Chapter 406: The Girl Within the Crystal, Review and Commentary/@comment-24536822-20141027163534/@comment-24800928-20141028210654

well gray has been roaming for a little while.

No matter how the scarf would have been found it would have seemed to be a coincidence. No way anyone would have the time or focus to go searching for it when there are other more pressing matters happening. Winding a search for it into the plot, so that it can somehow save Natsu's butt is not really needed.