IRS Notice 54

I filed taxes earlier in the year, owing around $60, which I paid with the filing. Then I got a Notice 54 with a check for $14, stating I would "be receiving a notice in a few days that explains why the check is different..."..."Please do not call us until you receive the notice."
It has been about 6 weeks now, and no "notice" has appeared. I know: this is small beans, but it is annoying. N.b.: No math errors noted on my straightforward (paper) return (copied from a spreadsheet I keep, which does the math, obviously).
Should I do anything but wait?
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Just take the money and don't worry about it.
If it's so annoying that you're willing to spend some time on hold, you can call the IRS at 800-829-1040 and ask them to resend the notice or to tell you why then sent you the $14.
Bob Sandler
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