So you are saying that they received one EIP, but not the other?  And they were not eligible for the second one, when originally issued, because of their income?  So why did they get the first one?  Or maybe they received the second and not the first?  

May be like my client who denied she received the $600 when asked in February, but now remembers that it was paid.  

I can't be too critical of those engaging in idle speculation here based on lack of information, because I'm doing it myself.