We had a bunch of devices in USM in the Inventory group that had duplicates appearing, so we selected a bunch that showed up as devices with the same name as Host's, so we have been selecting the devices and clicking "delete selected" under Actions drop down. And leaving the defaults checked off , prevent re-discovery, acknowledge alarms, and delete measurements. This gets rid of the duplicates in USM. The problem is, that a production system that was a host was selected in a group of selected devices during a routine cleanup and deleted. How do we recover this device? The device shows up in IM, but does not show up anywhere in UMP or USM.