@ TaxDonor
ADDENDUM
Of course, a day after I posted that info above about the $5,000 in I-bonds coming in 12 multiple denominations, I received mine in the mail today, and it was surprisingly a single bond for the full amount. This is completely different from what it clearly says on the Treasury Direct website and in financial articles, where it says to expect multiple denominations. So maybe they have changed the protocol this tax season to reduce mailings.
