HP Color LaserJet 4730 Multifunction Printer series - Manual (Page 209)

Locking the formatter cage
To purchase a locking accessory for the HP Color LaserJet 4730mfp formatter cage, please contact HP
at
http://www.hp.com/support/clj4730mfp .
The following figure indicates where you should place the lock.
ENWW Locking the formatter cage 189