8k is a joke, and the whole gearbox thing is a cop-out; any good dealer should know that's only with the 7-speed DQ200, but hey low balling is their game.
Not sure how fired up the used car market is still, but to give you an idea, I got my B7 with similar specs to yours ~8 years ago private seller (who was offered $14k trade-in on a new Mazda 6) with 60Kkm for $24k
tbh I think it might take a little while to find the right buyer privately, but they will know what they are looking for.
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