From October 4, 2021, OpenSea has changed its policy to hide all unverified collections by default.
1. To find your NFTs, go to: https://opensea.io/account?tab=private (Hidden Tab)
2. To unhide your NFTs, click on the ellipsis (3 dots) button and select "Unhide".
3. Then confirm your Unhide decision by clicking on the blue button at the bottom right corner. Voilà!
