Keep in mind most of the mail is sorted by the secretaries. Mail with Bank letter head is either tossed as junk, or forwarded to the Finance or Buisness Directors, and they then junk it because they do not see how it applies to them.
I would recommend calling the principle's secretary first and ask them to watch for it, or call and schedule a 5-10 minute appointment with the Principle or Vice Principle for a quick briefing of your intent.
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I don't repeat gossip, so listen closely...