S&S Questions

[ArdenNailo]

I am currently running the S+S and my players are loving it. However I have been trying to figure something out... The rumoured treasures in the back of all the books of the AP have locations.
But is there stats for these items or are they just points on plunder waiting for the players to find?

If there is info on them other than the little blurb at the back of the book where are they located?
And if there isn't then should I have them make Know (local,history, geo)to find the place with a encounter suited to what I think the item should have? And reward them 2-3 points plunder?

Also the party wants hidden weapon ports for a ship they want to build, do they still take up the 5 tons of cargo space?

[Uri Meca]

There's no other info on those inside-back-cover treasures. They are little plot hooks you can use as you see fit to whatever extant and effect you want. One group's Fellhope Fish Skull can be a mundane art item stalked by a serial murderer. Meanwhile, a different group can use the same piece as a strongly cursed soul-powered artifact.