Wrap your Curio Cards into ERC-1155, a token format compatible with the OpenSea collection, to list for a sale or auction, or unwrap your OpenSea wrapped Curio Cards back into their native ERC-20 form.
Alternatively, you can interact directly with the wrapper contract using the approve() and wrap() functions here: 0x3c2754c0CDc5499df1a50D608D8985070Bf87b30