I Have A Boosted Board V2 - what is it worth?

I have a Boosted Board V2 that my son bought brand new in 2017. Everything works. We have hand-held controller and charging cable. We have 2 batteries, at least one is an extended range. There is an extra set of brand new wheels. We have extra belts. We have 2 chargers. We shipped something to BoostedUSA at some point (2021?) to update some software on the batteries but I have no idea what was done. (maybe correct batteries and unlock speed???)

My son is looking to sell but we have no idea what all of this is worth. Any suggestions?

**EDIT - I guess pictures would help.

 

Anybody? Just take a guess...I have no idea so I won't argue.

 

Over 100 views and no responses?

This is a forum so I know you guys have opinions . Let's hear 'em.