Why do you think you need to identify wires >6ga in conduit bodies if you are not terminating or splicing in there?
For grounded circuit conductors (neutrals)
200.6(B)(3)At the time of installation, by a distinctive white or gray marking at its terminations. This marking shall encircle the conductor or insulation.
For EGCs
250.119(A)(A) Conductors Larger Than 6 AWG. Equipment grounding conductors larger than 6 AWG shall comply with 250.119(A)(1) and (A)(2).
(1) An insulated or covered conductor larger than 6 AWG shall be permitted, at the time of installation, to be permanently identified as an equipment grounding conductor at each end and at every point where the conductor is accessible.
Exception: Conductors larger than 6 AWG shall not be required to be marked in conduit bodies that contain no splices or unused hubs.
(2) Identification shall encircle the conductor and shall be accomplished by one of the following:
a. Stripping the insulation or covering from the entire exposed length
b. Coloring the insulation or covering green at the termination
c. Marking the insulation or covering with green tape or green adhesive labels at the termination
