I am not sure. However, I do know that Sheepskin is crafted into Fleece; which then can be crafted into Woolen yarn. Now...Woolen Yarn is used in A LOT of high level synths. People need +1 Woolen Yarn to make HQ armor; therefore, they need +1 Sheepskin.

Idk how much the +1 skins are selling for on Durandal, but they are probably worth a fair amount gil.

Hope I helped. I am sorry for your situation.