HP MFP M528f Monochrome Laser Printer - Manual (Page 57)

7. Close the front door.
8. Pack the used toner cartridge into the box that the
new cartridge came in. See the enclosed recycling
guide for information about recycling.
In the U.S. and Canada, a pre-paid shipping label is
included in the box. In other countries/regions, go
to www.hp.com/recycle to print a pre-paid
shipping label.
Adhere the pre-paid shipping label to the box, and
return the used cartridge to HP for recycling.
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ENWW Replace the toner cartridge 43