Try this,
as long as you have your sites and subnets assigned, this will show you the computers that are 8300's assigned to the site.
SELECT DISTINCT
i.Name AS 'Site'
,ip.[Subnet]
,vc.[Name]
,vc.[OS Revision]
,vhw.Model
,vhc.[Chassis Package Type] AS 'Serial Number'
,vhw.[Identifying Number]
,vhw.Manufacturer
,vc.[User] AS 'Primary Owner'
FROM
vsite i
LEFT JOIN vSiteResource sr on i.Guid=sr.Guid
LEFT JOIN vSiteSubnetMap ss on sr.Guid=ss._ResourceGuid
LEFT JOIN vSubnet sn on ss.SubnetGuid=sn.Guid
LEFT JOIN Inv_AeX_AC_Tcpip tcp on tcp.Subnet=sn.Subnet and tcp.[Subnet Mask]=sn.[Subnet Mask]
LEFT JOIN vComputer vc on vc.Guid = tcp._resourceGuid
LEFT JOIN Inv_Aex_AC_TCPIP ip ON ip.[_ResourceGuid] = vc.GUID
LEFT JOIN vHWComputerSystem vhw ON vc.GUID = vhw.[_ResourceGuid]
LEFT JOIN vHWProcessor vhp ON vc.GUID = vhp.[_ResourceGuid]
LEFT JOIN vHWChassis vhc ON vc.Guid = vhc._ResourceGuid
LEFT JOIN [CollectionMembership] cm ON cm.[ResourceGuid] = vc.GUID
WHERE vc.IsManaged = '1' AND vhw.Model LIKE '%8300%'
Check thread,