Dave - are you a criminologist?
Here's the deal with big versus smaller department. If you gave it to Lake Stevens PD, they may or may not be set-up to easily run ballistics. If they are set up for it, they'd absoultely do it. Snohomish Co. SO would absoultely be set up as they're a larger department. A small department would send it to the state crime lab if the case required it, but probably wouldn't just for a found weapon without having something they were trying to link it to.
What's troubling is that in MANY cases, the PD won't return the weapon to the finder "just because" even though it rightfully should be. A friend of mine is an attorney specializing in firearms law and much of his business is recovering weapons that belong to his clients and should have been returned by the PD but weren't... I have a real problem with how police departments handle firearms - sometimes they don't return things when they should and it takes a court order for the civilian to get their weapon back.
DD - if it was buried in silt, how did you find it? Metal detector or stirring up the bottom? It is a premium weapon and a great find. I did see the bluing coming off, but you can re-blue it. Wade's in Bellevue has a great finish-guy. If you really want to trick it out, check out
http://www.robarguns.com - the owner is a friend of my father and is alligned with Thunder Ranch. They have some of the best coatings and custom weapons around.