@ Tenebri - You are correct that it would not be a good idea, nor allowed, to make accusations of manipulation on the thread. If you felt the need, you could politely ask for more details, such as the identity of other party in the transaction or for screenshots, (but I suspect if that information was available, it would have already been provided.)
If you suspect manipulation, then you may wish to disregard the prices in one or both of those reports. It is up to each user of the thread to determine which reports are accurate.
As Mod Poerkie stated:
Original message details are unavailable.
We should no longer treat the forums as a source of truth and we advise everyone to do their own research before participating in discontinued and/or high value items.
Anyone using the thread for price research will see that the ranges don't always agree and is encouraged to make up their own minds as to which ranges they think are more accurate and reliable, (and there should be no flaming of or accusations made towards those whose ranges you disagree with.)