Here is the best advice I can give you - DO NOT treat the animals immediately!!
Get them in. Get them settled. Get them hydrated and feeding. They have made it up to this point in their lives dealing with parasites, they can wait a little longer until they have recovered first. Once you have done that, then get fecal samples and have them tested. There is no point in needlessly treating the animals since it is going to stress them more.
If the fecal shows signs of worms, then I would reach out to a reptile specific vet and confirm dosage that way. I know from experience that the dosage for Ivermectin in reptiles is different than in mammals so that may be the case with this as well.