Sam and Dean have been looking for the legacy of the man of letters. They been searching for months. They wouldn't stop til they found them.

one day Sam and Dean were at a restaurant looking threw old letters they found about the men of letters searching for the legacy. A beautiful women walked by and gave the boys a tip.

Sam and Dean looked at the women who "worked" there as they both smiled not suspecting anything

Sam: "and get this the le-" he looked to see the letters missing