On a correct 2022 Form W-2, I don't think it's possible that box 3 can be $800 less than box 5 unless box 3 = $147,000 (maximum possible) and box 5 = $147,800.
With no amount in box 12 with code S, the W-2 indicates that you made no salary deferrals to a SIMPLE IRA in 2022.
