MSG copy Table 3-2 item (2) "Microphone module (for use in models without a camera module)"; EMPR "SPS-BD MICROPHONE 14". PartSurfer lists it on all 8 SKUs, though only 3V199US/5C4Y7US lack a webcam (no-camera bezel M21386-001). Only needed on no-camera models. Listed for all 8 checked SKUs. OEM parts list only; not bench-tested.
Source notes
Saved HP PartSurfer product BOM(s) on box (partsurfer/cache_<SKU>.json, captured before this loop; no new HP fetch, HP OEM cool-down ON). Listed for 8 of 8 checked US product numbers (3V0K0US, 389J7US, 3A3G4US, 3V199US, 5B0T2US, 5C4Y7US, 437G6US, 3K0M9US; product name "HP ProBook 440 G8 Notebook PC (2Q524AV)"). HP description: "Microphone board - For use in models not equipped with a webcam". Keyword: Microphone. OrderFlag: 1. (via MM-LOOP-052).