costco的cash back reward certification

请问一下costco的cash back reward certification 是不是当年不redeem就作废了 ？

When does the credit card reward certificate expire? Your credit card reward certificate from your Costco Anywhere Visa Card expires on December 31st of the year of issuance. The certificate has no value if not redeemed in person at any U.S. Costco warehouse, including Puerto Rico, before the expiration date.
google 出来的，但你可以打电话给客服争取？不清楚能成不，有人在 reddit 说只要没用过就行
https://www.reddit.com/r/Costco/comments/9hf21l/executive_rewards_certificate_expiration/

我打电话问过，说是不会过期

谢谢，我去试试。

才知道不会过期，谢谢分享！

我记得当时收到的时候上面明白写明今年12月过期啊？是我看错了？最好还是打电话确认一下吧

我去年的没用。今年六月去买东西时，收银员给了我小$300刀。

亲给你现金返还了吗？