Well.... its actually an issue as we know it does contain fuel.
The cause of the ditching was fuel mis-management where the pilot took off using the aux tanks, and forgot to switch his fuel supply to the main tanks. So, when fuel exhaustion from the empty aux tanks forced the aircraft down, it had full mains. The landing damage was relatively minor so that fuel in the main tanks has been in there conveniently sealed up in a nice aluminum chamber at a steady 55-65 degrees F for the last 70 years. There is likely a similar potential source of engine oils and other fluids, not to mention explosive charges or even munitions that we hope were removed at the time.
When we were there in 2007, the fuel filler caps had degraded to the point where every few minutes a drop of avgas would leak out and we could distinctly smell it, so the fuel is definitely there. Based upon how it smelled, I wouldn't be surprised if it was still combustible, but my nose is not an octane meter by any means. Exactly how much fuel remains is anyone's guess, but the plan for recovery has to assume that the mains contain fuel that has to be dealt with.
Keep in mind that the Maid sits on the line between two ecological preserves, one marine, and the other shoreward, and the folks who administer those preserves are very concerned about any potential pollutants that may be released. This is actually a good thing, as it gives us some leverage to make the case that recovering the aircraft would actually remove an existing known source of pollutants (even though fuel would likely evaporate before causing any damage).
Andrew