[pescetom]

Simple 9x2 Mitchell with a Bye in EW.
You are called eight minutes through the round to a table in a side room where NS (who have already had their sitout) finally realize they are still waiting for their opponents (named on the phone app).
Who can be seen playing at the next table, which should be the sitout this round (both pairs at the table had the information to avoid this).
They have already finished the first board and are busy bidding the second.
South confirms he already entered the score for the first board, which is impossible.
You take note of the score (good for EW) and lead and then reflect on Law 15 and practical issues.
How do you proceed?