The question still remains, why is this information is important? This is a minor detail, imho, unless you're suggesting the FBI planted the money on Tina Bar? I don't get it.
I think that is exactly what he's saying.
Most people just state a theory and then provide evidence. This guy is working backwards - inductively. Then he's saying - 'that's not what Im saying? It's just a possibility.' which only confuses matters further. I believe this is the crux of why people are having trouble following his posts. He must be trying to compare an FBI document of serial numbers given to Cooper vs. a list of Ingram serial numbers?
FlyJack may be saying that the Ingram find represents serial numbers not 'in' the FBI's original list of serial numbers the FBI says were given to Cooper. In other words, the Ingram find is bills Cooper never had, but from some other list of money. If true that would be a revelation.
Of course the problem could be clerical. Flyjack's comparison of lists and documents may not be valid? Let me stop here so as not to confuse this further, whatever it is Flyjack is saying.

<edit> In other posts FJ has already said (a) the money was a late arrival - he seems to agree with Palmer's analysis, and (b) he has questioned fragments of money were found or have any significance. These two statements plus a claim the Ingram bills do not match the serial numbers given to Cooper, add up to support for a plant theory.