Good condition with all the parts necessary to build the set. The manual has signs of aging. The box front and back panels are in excellent condition, side panels may have some creasing from the box being opened. Some of the pieces have minor surface scratching under light, or very small nicks.
Some pieces may be slightly dusty or slightly discolored. If you're not a fan of that you can submerge the pieces in 3% hydrogen peroxide, and allow sunlight to shine onto the pieces. It will reduce discoloration and also help to clean off any dust. Sometimes I may do this myself to the pieces if they are very discolored before selling.
I may take apart the set in order to fit it in the shipping containers I have.