There is not much treasure in the immediate room. Grimjaw's maul is his only meaningful equipment. The reavers have a few javelins, their longswords, and shields. On the ground floor you find the kitchens and some servants quarters. The kitchens are full of worktables with old battered crockery, sacks, casks, and barrels. There is a supply of cheeses and smoked fish hanging from the ceiling, as well as a dozen casks of ale (worth 10gp per cask) and barrels filled withsalted meat.
On the upper floor you find an old library. One old shelf has been cleared and restocked with a selection of tomes. The books, a dozen in all, are worth 25 gp each. Most cover nautical topics and include charts, excerpts from ships' logs, and the like. There are also two magic scrolls among the possessions here.
In the main room on the upper floor you find Grimjaw's chambers. There you find 600 gold pieces, and an unfamiliar cloak (magic). Finally, in a small silk bag, you find a spherical lapis lazuli (magic).