Upvote:3
There are luggage lockers in the CTM bus station but these might not be as large as you would like.
In general luggage storage in Casablanca became a particular problem after 2003 and it seems train stations may not have left luggage facilities.
Various people have, in the past, recommended Supratours so it may be worth contacting them to find out what the current situation is.
Supratours have an affiliate that deals with post, cargo and storage. This seems not as geared up for the general public as most left luggage offices but might be what is required for larger luggage than will fit in 'normal' lockers. The company is SMTR CARRE.
Casablanca Airport offers a number of facilities but left luggage seems not to be included. On TripAvisor Khamlia 29 March 2015, 10:09 advises:
It is problem with luggage because at airport is not possible to store it.