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Since they came from an industrial farm, worming would probably be a good idea. There are lots of different options for worming - Wazine is really the only licensed poultry wormer, but only works for Roundworms. Praziquantel is off label for chickens but kills more species of worms, including tapeworms. Ivermectin is popular as well though it is also off label. Some people recommend garlic powder and Apple Cide Vinegar as natural options, but there is little scientific evidence that these are effective - and if they are, it is likely only as a preventative measure. Oregano oil is another natural option, and it has been scientifically proven to have noticeable effect in eradicating worms on organic farms; but I personally would not trust it to kill a known and established infestation.
In this case I would recommend either treating with either Wazine (roundworms are common) or Ivermectin, and you can add oregano oil or one of the other natural options at your discretion.