Where can I find NFT sales records?

Etherscan is a useful tool for exploring the Ethereum blockchain. If you've sold an item on Ethereum, you can search your wallet address to see your token balance or enter a transaction hash to verify transaction history. It's an easy way to verify whether a transaction was completed.

If you're using the MetaMask wallet, click on your Ethereum balance. Then select the three dots at the top right of the extension, and select View Asset in explorer to view your token balance and transaction history on Etherscan.  

Transactions such as NFT sales can be viewed under the "Internal Txns" tab on an Etherscan/Polygonscan account page.

Keep in mind the transaction records will show the fee received by OpenSea and, if any, creator earnings received by a project’s creator. Crypto wallets like MetaMask will not display internal transactions.

Alternatively, if you sold an NFT through an auction, you may need to add WETH as a token in your MetaMask or crypto wallet to view it there.