I have a question, there are 6 robotech Revell models 2 from 1984 and 4 from 1985 still in the box not put together and the unopen boxes are in really bad shape is there away to find out how much they are worth. Gartan 1/48, Exaxes1/48, Space Fortress SDF-1 1/5000, Attack Fortress SDF-1 1/5000