Derek jeter/Arod Game Used Bat

[memorabiliaunlimited]

i always wondered how someone could say for certain that a bat like this was used by a specific player other than the player named on the bat? sure, someone could say that the use characteristics are not what is typically seen on jeter bats, but how can a third-party attribute it to another specific player? in this case, unless it was acquired directly from arod who stated he used it, how do they know? this has always baffled me.

genuinely curious about this if anyone has an answer.