Power Outage - Clock Resets

[Spence]

Timeout with 2:43 left in the 4th qtr. I administer and look to make sure the clock starts properly . It does.

Ball is walked down the floor and subsequently there is a foul by B1 on the shooter. While reporting the foul the power goes out for a a few seconds. Whole building goes black. When it comes back on the game clock has reset to it's default of 8:00 and no score.

What are my options for the "definite knowledge?" If I ask the clock operator and he says the last time he saw was 2:35 can I put the clock back to that? Can I ask the official scorekeeper what the last time he/she saw?

In my game no one had any idea so I put it back to 2:43. Correct move?