HP Color LaserJet 5550 Printer series - Manual (Page 151)

5. Remove the new print cartridge from the bag. Place the used print cartridge in the bag
for recycling.
6. Grasp both sides of the cartridge and distribute the toner by gently rocking the cartridge
from side to side.
7. Remove the orange mylar strip and the orange shipping lock from the new print
cartridge. Discard the lock.
ENWW Changing print cartridges 137