Using other third party applications, such as 'Irfanview', does show the lens ID number included in the EXIF info for cameras with AFMA that can discriminate between two copies of the same lens model. Canon's own 'Digital Photo Professional' does not display the lens ID number, either. When using Adobe products (such as Lightroom or ACR), the field is never included in the EXIF info displayed by the application.
Apparently Canon only started including an "internal" lens serial number field in the EXIF info when they started including the ability for cameras with AFMA (Autofocus Micro Adjustment) to discriminate between two copies of the same lens model.
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