That damage is repairable from the inside of the cabinet I believe with blocking or bracing, but won't be able to hide outside damage without removing/damaging the decals I think. And I would assume more hidden damage. $6500 seems too much to me.

basically crack it open, clean it out so it sits flush when closed, glue it up and ratchet strap it til its dry.
then if you feel it needs a brace put it on the inside.

you might find one leg leveler needs some adjustment to square it nice

https://pinside.com/pinball/forum/topic/cabinet-restoration-vids-guide/page/3#post-3148186

Is that what age-related deterioration typically looks like? (I don’t recall ever seeing this on games from this era, but I am less experienced than many here.) If the rest of the game is solid, I wonder if that corner was actually damaged by an impact of some sort or improperly moving it.

I’ve only seen this on the front of cabinets and think it’s due to pins being shook and bumped thousands of times. Easy fix!

There is 0 mystery here. Someone pulled on the front bottom lip of the cab, or when unloading it got stuck. Happens quite often.