Superannuation payment for old outstanding super

I have one staff member who (for reasons outside of our control) didn't have a compliant superfund until a few weeks ago.

We're paying their current super into their new compliant fund account now however, there should be about $5000 worth of super unpaid.

The Employee Superannuation Advice report from the start of their employment to date says they're due $15718.19 and the Superannuation Payments by Employee report says they've been paid $5976.55 so they're owed $9741.64 which is exactly the amount I expected.

I then went into Pay Superannuation and put in the correct dates (which go back to 2017), expecting the outstanding transactions to be there waiting for me to tick and pay but there's nothing outstanding for this person.

I then went into manage payments but there's nothing that is awaiting processing there.

I don't have any unreconciled superannuation amounts on the bank statement.

Where is it and how do I pay it, please?

Thanks in advance