Are any of the storage or fishbox compartments on a 215 DC insulated?
Timing is everything.
You own a 1999 model. A member has offered a 1999 catalog they own for scanning and posting to the Forum.
This would be most helpful for you to see, in that these catalogs often list things like "insulated icebox/fishbox" as marketing material.
Hopefully someone will come along (maybe the member with the catalog) and answer your question.
That stated, my icebox and live well compartments on my 91 WAC are both insulated with spray foam. The fish box is not.
Looking at the 97 catalog listing for the 215DC shows an insulated bait well and insulated fishboxes plus the ice/drink cooler so....
I'd be willing to bet you have the same areas spray-foamed insulated on your 99.
Just an educated guess.