I took your suggestion and switched the rule to move the problem email to Trash. Lo and behold, one of them showed up there (and, of course, I immediately emptied the Trash). I doubt that any of these emails are actually things that I want but at least I know that the rule works.
Jon
macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365
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