I'm so very sorry for your losses, horrible.
Chickens are especially vulnerable at night, and need to be inside hardware cloth, at least, every night. During the day things can be less strict, with modifications, especially if you have electric fencing around their run.
Pictures of your current coop and run will be helpful, it all needs to be fixed before any more birds arrive.
Depending on where you are located, keeping them under a roof is best during this current AI outbreak too.
Mary
Chickens are especially vulnerable at night, and need to be inside hardware cloth, at least, every night. During the day things can be less strict, with modifications, especially if you have electric fencing around their run.
Pictures of your current coop and run will be helpful, it all needs to be fixed before any more birds arrive.
Depending on where you are located, keeping them under a roof is best during this current AI outbreak too.
Mary