I don't know what format Google Warehouse models are in, but if it's a format that Unity can import, then yes, you can use them in Unity.
Any assets or scripts that you find online are created by someone. You should always contact that someone, and confirm with them their exact terms. Just because an asset is available online does not mean you can use it. Some authors will post details about their terms. It's best to always assume you cannot use assets unless the website says you can, or you have contacted the author directly.
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