First off, I don't think it's very helpful to take complete guesses at a sword's worth and stating it as fact.

I would recommend to get in touch and arrange for established collector to look at this sword in person. As everyone knows it is very hard to judge a sword through pictures. I feel there's a good possibility this sword could be very good. They'll give you an approximate value, and probably agree that this is something to submit for shinsa without a doubt.

As for zet's sword... Unfortunately it has been very aggressively buffed with inappropriate materials .