A full parcel locker can mean that your USPS parcel locker is full and you need to go to the post office and get your packages.
A parcel locker is a large box with other doors on it with a key to access your package.
If you have a post office box then a key will be put in your post office box that goes to the parcel locker.
You then take the key, unlock the parcel locker, remove your package and the key stays in the parcel locker lock.
If you get your mail at a cluster box then the parcel locker will be somewhere near the cluster box or within the cluster box which is a larger size box with a key lock.
A key for that parcel locker should be in your box.
A parcel locker is a secure container that lets mailers receive large packages.
Parcel lockers are perfect for packages that don't fit into standard mailboxes.
Parcel lockers are usually located in common spaces to which couriers and USPS postal workers have easy access.