A return file does not need to be elaborate. It needs to let you explain which order is involved, what happened and what response you are seeking. Preparing that small record early is easier than searching through messages after the product and packaging have been separated.
Create a folder or note named with the merchant and order number. Save the receipt, confirmation and relevant product description. Include the selected model or variation, because a general link may later show a different offer. Keep the return instructions that apply to the purchase and note the process described by the seller. Conditions and procedures vary, so avoid relying on what another retailer did previously.
Describe the issue in concrete terms. “The shade listed in the contents is missing” is clearer than “the lamp is wrong.” “The delivered size is different from the ordered size” is different from “the size I ordered does not fit.” These distinctions help you choose the right description and avoid sending a long account that leaves the central problem unclear.
Take useful photographs when they help explain the issue. Show the item, relevant label, contents and packaging as appropriate. A few clear images are easier to review than many nearly identical photographs. Keep original files if possible and avoid making changes that obscure the detail you need to show. Do not disassemble or alter the item just to produce a more dramatic image.
Contact the seller through the stated channel and keep the conversation together. Provide the order number, short issue description and requested outcome. Record any instructions about packaging, collection or posting. If different messages conflict, ask for clarification before sending the parcel. Do not assume that an address on the outside of the original box is the correct return destination.
Imagine a hypothetical lamp delivered without its shade. Your record would contain the order confirmation, the listing's contents, a photograph of what arrived and the support exchange. That is more useful than dozens of screenshots of the store homepage. The file shows the specific difference between the purchase and delivery without asking the reader to reconstruct the story.
When handing over a parcel, retain the available proof of collection or posting and the reference used to track it. Keep the file until the stated outcome has been recorded and any remaining questions are resolved. Then archive the concise record rather than keeping an active pile of packaging and messages indefinitely. The aim is an understandable purchase history that supports the merchant's actual process, not an unnecessarily complicated administrative project.