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A "do nothing" approach usually earns a defect for the seller.
Most disputes revolve around a seller problem after the item has been delivered — to which the seller must respond within three days to offer a return label, a refund without a return, or a partial refund negotiated with the buyer.
Or, if it is an item not received, then upload tracking that shows delivery, or that shows movement in transit to arrive in a few days. Otherwise, if lost or tracking shows no further movement, then refund within the dispute and open a claim with the carrier.
Lastly, a dispute that originates from a banking entity (questioning a charge from eBay) is something that eBay will manage and eBay may ask for further documentation from the seller. That may be your "do nothing" scenario.
