No, you are on the right path. The question about where is this distribution from is probably so that states that don;t tax federal pension can identify it to exclude it.
The question about "what did you do with it" is trying to see if you spent the money so it's taxable income or if you rolled it over into another retirement account.
Next you may get a "Was this a Qualified Disaster Distribution?" (Answer No (unless it was).
Next you will be asked if you received periodic payments (typically monthly) or a single distribution (probably periodic).
Next if your payment were periodic you will be asked if you started these payments in 2019 or in 2018 or before.
If you answered 2018 or before, then you are finally asked if the amount in Box 2a was the taxable amount in previous years. If yes, then select "YES" and the box 2a amount will be used.
If the OPM kept track of any after-tax contributions to the retirement plan (or if there were no after-tax contributions), then the box 2a amount is likely to be correct. You're done.
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