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This smells badly of retaliation for you submitting your retirement. Such retaliation is prohibited and can be reported to the EEO for investigation based on discrimination and retaliation under the Age Discrimination in Employment Act. An employer cannot seek to discipline an employee for retiring and here based on the timing it appears that the supervisor is using this taking of paperwork as a pretext for such discrimination.
Thus, your first step is to file a complaint with the EEO and have an investigation started regarding the retaliatory harassment based on age and you submitting your retirement.
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