our fr10 controller has no parcel number of its own

Yes, second crate listed. Seller sent a collection receipt, but its mark is the arm crate we've already received

Then ask the collector about the second mark directly through whoever booked the transport, keeping the received arm receipt attached so it doesn't become their answer again.

Their shipping contact says the controller crate went through another agent. New agent name, still no receipt for that crate

Did your agreement name who arranges that other leg? Not saying you should chase every subcontractor yourself. I would want the seller's shipping contact to explain who can actually authorise a search and report back.

And ask whether the new agent can identify a physical crate. An agent name alone gives you little to trace.

Jasper, yes, one person needs to bring the answers together or Henry gets another tour of company names instead of his controller.

Seller arranged both legs. Its shipping contact now owns the search. The second agent has found the marked crate in its receiving area and confirmed the listed controller and cable contents; no onward dispatch arranged yet

Useful progress. Who is booking that onward movement now? I'd keep your installation plan provisional until they can give you an actual arrangement, even though the crate has finally been found.

Seller's shipping contact is requesting the booking. Nothing confirmed. Thanks, Yasmin, pointing the search at the second mark stopped them sending the arm receipt for a fourth time