HP A7W94-67001 scanner lower cover is a replacement cover part identified for HP PageWide equipment. Its stated role is specific: it fits the lower part of the scanner assembly, rather than serving as a general printer cover.
The parts catalog lists it among the covers for the HP PageWide Pro 750 family. It also identifies the part for HP PageWide Managed MFP P77740, P77750 and P77760, HP PageWide Managed P75050, HP PageWide Pro 750, and HP PageWide Pro MFP 772 and 777. This makes the part reference useful when sourcing the corresponding scanner cover for one of those listed models.