Asset Radar: found but not in asset list

[ufficioced]

I created a report for finding Asset Radar entries not present in any mac address previously scanned in some asset, do you think I did it right?

Here is the report I created:

  Select Top 1000000
  Case
    When tblAssetRadarDevice.DeviceName Is Not Null Then
      tblAssetRadarDevice.DeviceName
    When tblAssetRadarDevice.MacAddress Is Not Null Then
      tblAssetRadarDevice.MacAddress
    Else ''
  End As DeviceName,
  tblAssetRadarDevice.DomainName,
  tblAssetRadarDevice.MacAddress,
  tblAssetRadarDevice.DiscoveredBy,
  tblAssetRadarDevice.Ipv4Address,
  tblAssetRadarDevice.Ipv6Address,
  tblAssetRadarDevice.IpSubnet,
  tblAssetRadarDevice.DefaultGateway,
  tblAssetRadarDevice.Manufacturer,
  tblAssetRadarDevice.FirstSeen,
  tblAssetRadarDevice.LastSeen,
  tblAssetRadarDevice.PingTtl,
  tblAssetRadarDevice.Rtt
From tblAssetRadarDevice
  where tblAssetRadarDevice.MacAddress NOT IN (Select tblNetwork.MACaddress FROM tblNetwork)
Order By tblAssetRadarDevice.LastSeen Desc,
  tblAssetRadarDevice.MacAddress