Matt, that was my first thought, but there's a problem if they just defined the identity property for the column without expressly creating a constraint.
Create table dbo.dummy (ID int identity(1,1) primary key, filler char(100))
select * from information_schema.constraint_column_usage
where table_name = 'dummy'
There's a constraint on the ID column for the primary key, but not one for identity. You can drop that constraint and ID is no longer the primary key, but it is still an identity column.
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