Being given keys in a tatty box doesn't mean he owns it, looks more like rented to me.Those are the keys to his penthouse. You don’t get keys in a box like that from renting it.
Him and Caspar at the height of their game would have been raking it in with minimal expenses, getting clothes sent to them, Wagamama/ Nando’s etc for life, free flights, holidays, loaned cars etc.
Probably free bottle service for mentioning clubs on insta etc.
So most of his earnings would have been his to invest.