I returned the tool interface module to the seller's confirmed service address, but tracking says delivered and their service contact says no item booked against our case; what should I send to connect the parcel with the actual module?
Ask for a named person to own that receiving-to-service search. Your evidence sounds joined up already; it needs somebody at their end to find the box (and confirm the contents).
Yes, Toby, visible in my label photo; Jasper, a service coordinator is now handling the search, but no module location or intake reference confirmed yet.
Keep the cell-out-of-service status attached to that case. A named search contact helps, but nobody has assessed your module or given you a repair timetable yet.