Help with ISLA CANGREJOS buried treasure

[dizzymommy]

I need help please! I spent over an hour searching this island and can't seem to find the right buried treasure. I need to find the buried treasure that contains the severed arm I think it is. My compass doesn't show yellow dots like its supposed to and I've searched and searched with no luck. I don't know how many i've unburied and even dug up ones I've already found multiple times. Can anyone tell me approx location where they found theres? I would be so grateful!