Yes, baffles are normally checked every time the tank is pumped by looking in the tank with a light or a mirror. If baffles are cement on older tanks, the outlet baffle can fall off.
Distribution Box is a box that connects the outlet pipe to the other pipes in the system. It should be checked when the house is 12-15 years old or older. Distribution Boxes last longer on houses on town water and corrode faster on well water or if water softener discharges into the septic tank.