Condition for Models:
Mint - In perfect condition as near as brand new as feasible to find with next to no flaws
Near Mint - Item will have a few minor edge nicks or slight decal loss to the edges
Excellent - Item will have paint nicks/decal loss maybe larger
Good - Item will have several more obvious paint chips/defects or decal loss
Fair - Item will play worn with no broken parts
Poor - Item will Item will be in need of restoration with broken parts and heavy play wear

Grading for Boxes:
Mint - In perfect condition as near as brand new as feasible to find with next to no flaws
Near Mint - Box will have slight creasing
Excellent - Box will show more creasing or slight ageing/wear and tear
Good - Box will show even more creasing or ageing, wear and tear inc actual small tears
Fair - Box will be complete but heavily worn or creased or torn (or all!)
Poor - as Fair but with flaps missing and/or other more severe damage