How to prove I have the Blended Retirement System

I know there's been several posts on this, I can't comment on them to ask specifics. Back when I was a PFC I opted for the BRS. Now I'm trying to get the Continuation Pay and need to prove that I have the BRS. My LES doesn't have anything on the "Ret Plan" section. The boxes for the "CM AGCY CONTR" both "AGCY-AUTO" and "AGC-MATCH" say .00.

I have been using TSP since I enlisted. Is there somewhere else I can prove that I opted for it? Or show that I didn't/the request didn't go through? Thanks in advance.