If it's important to you, insurance policies vary.
I returned a gun to a maker (sorry, but it was very poorly made--didn't show up in his photos). He didn't tell me he wouldn't be home, and I shipped it "signature required." I was told to call by a certain date and remove that stipulation. When I called, it was already on its way back to me--early, and at my expense. I re-shipped it. Then it came back to me damaged. It had been damaged on the way TO him, not the way back, but I had to make the insurance claim, as the shipper. When it arrived, the gun was broken at the wrist and the lock and nosecap were completely missing. I called the maker. He said he'd removed the lock before returning it. I did all the work to get the insurance payment, which took a couple of months. Then sent the check to the builder. Also sent him the box of parts, at his insistence. Hardware and barrel were still usable, and he had the lock. I was out shipping SIX times across the country, and the builder had FULL payment AND all the parts. I consider myself ripped off, AND will never ship FedEx again. Ever.
Or, by the way, recommend this fella. I won't defame him, but I won't recommend him.
I once had an insurance claim with UPS, and had the money in two days.