Am I obliged to repay overpay- paid to me after my date of termination- from a former employer?

If your employer mistakenly paid you wages for time you didn't work, and you received the wages and he has asked you to return the unpaid portion, he has a legitimate legal claim against you for unjust enrichment if you retain the money.  The question from the employer's perspective is whether he wants to engage in the expense of suing you for the overpaid wages.  The question from your perspective is whether you want to be an  honest person or one that takes advantage of other people's mistakes to enrich yourself.    Michael Caldwell 404-979-3150