Many of us dual-box or work with others frequently. it is sometimes vary tedious to trade and impossible if not at the same station, then a contract is needed.
In RL, lockers or even storage areas can be rented and access is given to those who need it. Maybe Eve could add containers or even station warehouses that would work like a corp hanger with the owner configuring access and setting passwords and permissions. Of course the station management / owners can charge rent.