Hi,
IKEA accepts returns of goods within 3 months in original packaging and with receipt at full price. In most stores, opened goods are handled as follows: Please try to open the package with the cover as carefully as possible and, if it does not fit, repack it properly. Then IKEA will usually refund you the full amount as a gesture of goodwill. If you fail to do so, meaning the packaging is severely damaged, the cover is soiled or damaged, etc., IKEA reserves the right to deduct up to 50% of the new value since the goods can no longer be returned to regular sales.
Um ganz sicher zu gehen solltest du aber IMMER in deinem EH direkt nachfragen unter welchen Bedingungen du die geöffnete Ware zurück geben kannst.
Regards
Nayla