This query will show active assets not scanned via IP address and the LSPush agent.
Select Top 1000000 tblAssets.AssetID,
tblAssets.AssetName,
tblAssetCustom.Manufacturer,
tblAssetCustom.Model,
tblAssetCustom.Serialnumber
From tblAssets
Inner Join tblAssetCustom On tblAssetCustom.AssetID = tblAssets.AssetID
Where tblAssetCustom.State = 1 And tblAssets.LastIPScan Is Null And
tblAssets.LastLsPush Is Null
Order By tblAssets.AssetName