Number Sequence
These tapes were surprisingly newer than all the uncovered treasures. Was this perhaps someone that had found the treasures, gotten the same messages and decided to leave a warning for the next finder? This was becoming more and more unsettling. The tapes were all numbered. A number sequence perhaps?

Number Sequence
Unmarked Tape
Five out of six of the tapes had numbers on them. Why was one left without a marking? Was this a warning or a game? It was all becoming too much and they decided now was the time to alert authorities.

Unmarked Tape