Two Minutemen placed on alert at Vandenberg on October 27, rising to five on alert by October 31st. These were taken off alert once the crisis ended.
Two Minutemen placed on alert at Malmstrom on October 27, rising to nine on alert by October 30th.
Thanks for the additional info! I found a trusted source that said the Minuteman I did not achieve Initial Operational Capability (IOC) until 30 November 1962, although some "operational" missiles were delivered to the Air Force in July. Apparently with the crisis spinning up the decision was made to make available all assets, even the ones that may not be fully ready, and these must have been the missiles that you referenced above.