Hi Jacque,
Welcome to BOL!!
Since your footnote does not state anything about limiting external funds, and does not state that the bank reserves right to cancel or change the promotion at any time I would personally be very hesitant about limiting. This is likely a question for your Legal Counsel. There are state/contract law and UDAAP issues. I would just wait the additional six days and consider it a lesson learned.
Scenario - New customer walks in and says, "I have this ad and I want to open a 100k CD at that rate." Telling him that your sorry but the promotion is over could be a troubling scenario. .
Again, more of a legal question. Check with your attorney. Good luck.
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The opinions expressed are mine, do not represent the opinions of my employer, and they are not to be taken as legal advice.