Self-service return eligibility is tied cleanly to a normal order → ship → deliver record. Your second order has an unusual history, and Microsoft's own support forums confirm that when an order's billing/fulfillment record is irregular like this, the system often doesn't expose the return button even though the item is well within the return window. This is a known gap — the standard advice is to go straight to a live agent rather than trying to force the self-service flow.
Best approach
- Keep the Surface completely unopened.
- Contact Microsoft Support
Call 1-800-642-7676 rather than continuing to look for the button. When self-service returns aren't available on an order, this is the official channel Microsoft directs people to — phone reps can manually initiate a return and issue a prepaid label even when the web flow won't show one.