Need to fix line voltage outdoor lighting

We just closed on a home and it appears that there is line voltage outdoor lighting. The thing is, I can't get any of them to come on. The reason I am assuming it is line voltage is because there is a switch for it in the panel and also because every light has a box next to it.

I would like to get this outdoor lighting working as painlessly as possible.

I haven't checked the bulbs yet, but my first order of business will be to check each light fixture to see if there was any power on it with a volt meter. Problem is, I don't know which switch in the house or garage turns on the outdoor lighting which is in the front and back.

Will this simply be a matter of trial and error to determine which switch or switches powers the outdoor lighting?

Thanks for any tips or suggestions.....