When a Walrus Site is published, each file is created as a new blob, and the respective blob ID is generated. The publication process also provides the object ID for the Walrus Site itself, which is required if you intend to link a SuiNS name. If you missed saving this information, browsing your transaction history via Solscan using your wallet could help retrieve the object ID as it would be tied to the transaction history involving your Sui activity.

If you didn't save your site's object ID during publication, a handy tip is to check the Solscan for any blobs published using your wallet address. Solscan can display various transaction details associated with your wallet which might help you locate the object ID you're looking for.