The holotape can be found in Sugar Grove.
Beverly Solomon: Beverly Solomon, Cryptid Analyst, 9/27/77. Grafton Monster witness report. This is from one of those spelunkers that roam the hills looking for abandoned mining claims. Can you imagine? Well, the classic four-foot wide shoulders, headless profile, deep sonorous cry, they got a good glance at it. The witness didn't know what it was, but the description is very clear. It came out when she started playing a mouth harp, apparently! I'm going to go out to go look. Maybe that sound is the key....