Some banks create fictitious numbers to identify NRAs. They use 8s to denote "W8". I suspect your examiner may be looking for bogus TINs.
I print a bogus TIN report periodically using all 1s, 2s, etc, 123456789, and 987654321. Of course, then I have to be restrained.
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Life without Jesus is like an unsharpened pencil - it has no point.