We have the fitted adapter, not the extra one on the order, and the seller keeps telling purchasing to add something else so the spare can travel with it (quite a cure for a shortage).
Had a spare cable bundled into an unrelated enquiry once. Every answer then referred to the new quote and the original missing item disappeared. Keep this tied to the existing order and ask for separate delivery or a priced alternative.
They'll send it without charging for the adapter, but want us to cover the freight; I've asked purchasing to compare that with a credit and a locally sourced spare.
A credit can be sensible here. Just price the actual replacement, including checking it, before accepting a figure based on what the seller says their extra adapter costs.
Beth, agreed on replacement cost. But Anna may prefer the known ordered spare if the separate freight is tolerable. Get both totals in front of purchasing.
Jane, maintenance has specified the replacement interface and fixing details; Aisha, purchasing has both prices now and the separate-shipment option is cheaper, so we're asking for that freight charge in writing before agreeing.