sp_ms_marksystemobject

On searching for a table I found it to be hidden. Turns out it was marked as 'ms shipped' i.e was a system object.

select * from sys.tables WHERE name = 'sysssislog'

To achieve this yourself you can use sp_ms_marksystemobject

EXEC sp_ms_marksystemobject 'dbo.sysssislog'