Mongoose Foldable Bike w/extra parts

I don’t know much about bikes in general but my nephew had me spend a ton of money on this “bicycle”....it’s Mongoose w/Mongoose tires & it’s a foldable which, I guess, speaks to its capacity as a vehicle. I thought it was special for rugged terrain but he used it on bike trails & tracks for “tricking”/stunts. It’s a greenish minty color w/silvery undertones. It has some extra pieces bc nephew modified some components. It’ll definitely need TLC. Asking $ reflects ship/deliver based on destiny😊