[uuyi]

Had this on eBay a couple of times. You need to photograph the package before you send it inside and out if it’s worth anything significant. UPS and Hermes at least won’t pay out on delivery unless you have some evidence.

Other option is hire someone with a chair leg to go and get the parts back. If it’s eBay look at their for sale list - some people are stupid enough to relist what “didn’t turn up”.