So you are saying that it could be that Todd was lying. Which proves my point that the only alternative to CE399 being the bullet found by Tomlinson is one in which someone was lying.
So, again, what reliable knowledge do you have that any of those people were lying?
Your question, to which I responded, was; "how does Todd's verification NOT verify that the bullet that Rowley received from Johnson was CE399 (unless Rowley was lying and substituted another bullet)?"
Do you now agree that Todd's verification does not automatically verify anything other than that he received a bullet from Rowley?
As for the "reliable knowledge" question, there are two sides to that coin;
Do you have reliable knowledge that nobody was lying?
Can a circumstantial case of possible evidence tampering be made? Yes...IMO it can.
Will that case ever be conclusive? Based on the evidence now available, the honest answer would be no, but it leaves a bad taste in my mouth...