Importing a Private Key
If you participated in Curio Cards back in 2017 your card wallet might be saved simply as a private key. You can use this to access your Cards, but it is not recommended that you keep this private key accessible.
In the following steps, you could find yourself accessing passwords, seed phrases, and private keys. BE CAREFUL! Anyone with access to this private key or seed phrase can steal all your funds and cards. Curio Cards, MetaMask, MEW, etc, will NEVER email or message you requesting your private key or seed phrase FOR ANY REASON. There is no valid support reason for anyone to need to request this information. You are the only person who needs to control, backup, or access your wallet.
Note on Backups: Importing an account this way will NOT include it in your MetaMask Seed Phrase backup. You will need to backup the Private Key yourself.
Note on security: BE CAREFUL! Anyone with access to this private key or seed phrase can steal all your funds and cards. Curio Cards, MetaMask, and MEW will NEVER email or message you requesting your private key or seed phrase FOR ANY REASON.
It is a good idea to transfer your cards out of this imported address and into a MetaMask address that is covered under your Seed Phrase, or backed-up on a Hardware Wallet. You will pay gas to perform this operation, but you will no longer need to keep a private key on hand (less secure)