I sent an item last week and tried to purchase SC, but the clerk said that she couldn't add it. She said that because the item had $800 insurance, a signature was automatically obtained. I was nervous but took her word for it. Tracking it on the website, it did say that a signature was required.
On a separate note, I returned something to Tradesy using their USPS label, and they sent me an email a few days later letting me know they received it. When I looked online though, it is still saying it is in transit - delayed and no updates for over 2 weeks. Because of the value of the item, there should have automatically been a signature but it was never obtained