Does this mean the item will be mlb authenticated?

[brianborsch]

I won an opening day jersey from mlb.com auctions and I assume it will be mlb authenticated as it is advertised as game used in the home opener series and it had this hologram visual with the statement : "gauranteed authentic".
13361

So what is all of your experience with this? It was a co-steiner auction for a Dodgers Home Opening Series 2008 jersey.

Brian B