I would drop the glove box out completely. Not hard just squeeze the sides and lower then pull off the clips on bottom holding it will pop off.
Drive it see if you still hear it. Then go in with a flashlight and look for anything that may move or is touching and can cause vibration. Do you have a glovebox light? Check the wiring for that. Maybe also check the hvac duct (wide black plastic behind the glovebox and to the left.
These cars do have a lot of little rattles when cold especially if you have any poly or aftermarket motormounts