You need to make sure that those items that you believe may have been missed have not really been fully depreciated and that is why there was no depreciation.
Those items could have been written off through Section 179 or bonus depreciation in a particular year.
To verify this you would need to review all past copies of your tax returns.
*A reminder that posts in a forum such as this do not constitute tax advice.
Also keep in mind the date of replies, as tax law changes.
