To identify which deployments has been created for a client but reboot not suppressed you can query Configuration Manager DB with below SQL query;
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Select * from v_CIAssignment
where CollectionID in (
select v_FullCollectionMembership.CollectionID As 'Collection ID' from v_FullCollectionMembership
JOIN v_R_System on v_FullCollectionMembership.ResourceID = v_R_System.ResourceID
JOIN v_Collection on v_FullCollectionMembership.CollectionID = v_Collection.CollectionID
Where v_R_System.Name0='2012R2CAS'
)
order by SuppressReboot desc
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Suppress reboot codes means ;
0 = No Suppress
1= Suppressed for Workstations
2= Suppressed for Servers
3= Suppressed for all clients
Please be aware making changes on Configuration Manager Database manually makes your environment not supported by Microsoft.
Ozan YILMAZ
Premiere Support Engineer
MSFT