It would depend on the prints and records. The actual records may actually only have value to your family. It would depend on their content, I'm sure. By prints, I don't know if you mean photographs or decorative prints, but either way you might want...
You get access to the royal treasury after you've solved the mystery of who tried to have the king killed. If you go to the thieves caverns, eventually (top segment of the "star"), you'll find the thief in blue who will only reveal who hired him if y...
as per artprice.com: 1854-1922, in 2006 his drawings sold for between 950 and 1'000 usd. so, better check whether they really are prints and not originals:)