Isla Perdida Diamond- Help!

[MariaSeaMorgan85]

I am on a quest that is telling me to go to Isla perdida and find a treasure chest. It also says that I will find it "deep in the jungle, among the undead....only there aren't any undead on isla perdida there are only wasps there. And the only dig spot I found was not correct. I have tried it three times.

Anyone else have this quest yet? Any tips?

(this is part of a quest for Nil Offrill, to pay back his debts. the diamond needs to be returned to Andrew Bowdash on Tortuga.)

Thanks in advance for your help.