Since it looks like you are the agent you need to contact the listing agent so you can find out how to get into the gated community of Deercreek. If the listing agent or owner calls the gate I'm sure you can get in. As to the lockbox you need to call the listing agent. I'm a member of Deercreek so know a little about the gate. If you go to the gate and show your card and license they will call the owner to get permission.
Prime Properties of NE Florida