Now the show is over and it´s time for some flashbacks. Find clues in the previous episodes that will lead to the final location. They are found in the geochecker of the mysteries, TLM #1-#7. All clues are marked FB and after that you should be able to get a 4-digit number starting with 1.
Even though some odd events have occurred along the way in the end they can add up to helping you find the cache if you just can see through the noise and get the final instructions.
Va gur purpxre, ernq pnershyyl.