Sometimes when troubleshooting SCCM client software inventory, it is useful to retain the XML file which contains details on what the scan discovered.  To do this, simply create a file named “archive_reports.sms” within C:\WINDOWS\system32\CCM\Inventory\temp\.  If the scan is just reporting a delta, the file will be small.  But if it is a full SINV scan, then it could be large (the biggest I’ve seen is around 75 MB)