I think there's more than just a bit of tidying up, as one of the toggles looks like it's snapped off and the jack socket looks to have had an impact, so it's pushed in at an angle and the wood is damaged.
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£300 seems a bit high for that Thunder 2, given that some of the electrics are broken and the wood around the jack socket is damaged.
You'd also have to factor in finding the right knobs for it.