Concept:
Obsessive Compulsive Personality Disorder is characterized by perfectionism, orderliness, control, rigidity, and difficulty discarding items. The person often lacks insight and may consider the behavior normal.
Step 1: Identify personality traits.
The patient has:
\[
\text{Perfectionism + need for order + difficulty discarding things}
\]
Step 2: Note the lack of insight.
He denies complaints, suggesting ego-syntonic behavior. This is typical of personality disorder.
Step 3: Differentiate from OCD.
In OCD, obsessions and compulsions are usually ego-dystonic and distressing. In OCPD, traits are long-standing and ego-syntonic.
Therefore, the correct answer is Obsessive Compulsive Personality Disorder.