No, Form 8606 was not required at the time of the rollover from the 401(k) to the IRA. With regard to traditional IRAs, Form 8660 is only required for new regular nondeductible contributions (a nonzero line 1) and for distributions (lines 7 or 😎 if your traditional IRAs have basis. The IRS expects you to remember that you rolled basis from the 401(k) to the IRA and to report it on the next Form 8606 required to be filed, even if that is many years later.
