As surprising as it may seem to some, not every roster move gets immediately announced or even discovered until well after the fact. If a signing doesn't involve making a change to the active or 40-man rosters, those transactions can get lost in the shuffle pretty easily if the agent(s) of the player don't make an effort to publicize it. As it turns out, the Atlanta Braves made one such move last month that is only being reported now.
Veteran swingman Elieser Hernandez isn't unfamiliar to sharp-eyed Braves fans as he was a thorn in their side when he pitched for the Marlins.