There can be the user can find the stolen packages through there can be responsible for the tracking period are not to be undone by the users. If the packages are not delivered so that UPS can help with performing & locate to tracking the package if the package was not found, that the end of the Shipper can file a claim up to the declared value of the package of the contents.
Does UPS Responsible For Stolen Packages?
UPS Stolen Package Claim
UPS Stolen Package Investigation