I assume they were laying five months ago? How old are they and what is their laying history?
That does seem a long time without any eggs for that many hens. If you are north of the equator the prime factor is probably the molt. With the days still getting shorter they may be slow to start up again. I assume you are not extending lights to make the day longer?
A very common reason we think hens are not laying is that they are hiding a nest from us. How possible is that? That should not explain that many eggs but it could explain a few.
It's possible something is getting the eggs. Most things leave some kind of trace, egg shell or a wet spot. I don't know what critters might be where you are, but in North America the typical things that take eggs without a trace are snakes, canines, and humans. It does not sound like a snake. I've had those. They eat some eggs and go away for a few days to digest them before they come back for more. If it is consistent it is not a snake.
Here a fox or coyote would probably be more interested in the chickens than the eggs so it is unlikely one of them. But dogs can leave the chickens alone and eat eggs. Does a dog have access? Could be your pet or someone else's.
I'll leave human to you. That doesn't necessarily mean a thief. Sometimes people think this kind of stuff makes a good practical joke.
Odds are it is just the molt. It usually is. Often some of mine start back up when they are finished with the molt, even this time of the year. But some of them wait for longer warmer days.