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Hi Ichigoh
please do not create multiple ticket about the same issue/user. You could update the first one.

Remember that users have one week to provide the feedback. FAQ:

The winner has redeemed my gift, but not marked it received. How do I proceed?

• If your gift has been activated or redeemed by the winner, and they have not left feedback after seven days, please create a support ticket to request received feedback. A support member will review and ticket, and if the gift is activated on the winner's Steam account, approve the ticket and update the feedback to received.