HP RL2-1827-000CN upper cover is a replacement cover for the staple stacker multi-bin mailbox assembly. It is a service part for the cover area of this printer accessory.
HP’s repair procedure identifies the part by its exact number. To remove the existing cover, the procedure opens the rear upper cover, removes one screw, then lifts and slides the upper cover out. The instructions state that no special tools are needed for removal or installation.