Free agency is entering its fifth day (it only seems like 43) and the San Francisco 49ers have been busy making roster changes. Let's take a look at what has gone on so far:Returning free agents: Receiver Anquan Boldin, kicker Phil Dawson, cornerback Eric Wright.Departed free agents: Safety Donte Whitner (Cleveland), cornerback Tarell Brown (Oakland), running back Anthony Dixon (tweeted he is signing with Buffalo on Saturday).Released: Cornerback Carlos Rogers.