Hi,
like Matthew explained.
In the database, all old devices are stored - but marked with a destroy date.
Therefore You have to filter the devices.
If You use the filters and the device is still reported, then check the amount of bucketfiles? Probably the database is not up to date.
The update of the inventory in the SRM-DB runs only once daily. ... if You delete a device, you could run reports for it at the same date.
If You are able to check the datasource via mySQL you will find the table for devicemodels.
.. show tables like '%device%'; ..
then use desc "tablename" ..
then You should be able to build a query to fetch exactly this record.... and You will (hopefully) find a column with the destroy - date or destroy-flag.
Best Regards
Erich