Here's my '99 I bought a few weeks ago ($9500).  Ocean Jade Metallic was a listed color option for '98-'99 ($805 extra).  Mine came from Arizona by way of Texas and is now in SW Okla. 86K miles. It has the Sport Package w/ the Sport Design wheels (Sport seats, upgraded interior, 3 spoke wheel, etc) and a few more goodies.  I see very, very few early Boxsters w/ sport seats and optioned like this.
I bought it for the color and the interior package.  Not a whole lot of Boxsters like this and I didn't have one in my fleet.  Now I do!  

   I don't know how rare the color is, but yours and mine make only 2 that I've seen in the wild. 
Now when I find a nice Zanzibar Red 986, I'll be mostly complete.  Except I've always wanted a Forest Green w/ Boxster Red leather interior.  Then I'll be rare color combo complete.  Maybe...
***If you are selling yours, consider selling me the hard top separate?  Seriously - I'll grab it from you for more $ than it adds to the value of your car by having it.  PM me if you are interested.
Rick