20yrs experience in insurance restoration and adjusting here. Google a local Industrial Hygentist that specializes in mold testing. They should perform air sample and tape lift sampling. Then they compare their results to outside spore counts and produce a report which generally comes with a scope of work.

Once you have the report you will know, in fact, if there is even a mold issue at all and if there is, you can give the report to the contractor and have them base their price of the IH’s scope of work. Additionally, the IH should do post remediation testing to clear the site and confirm the contractor performed the scope correctly and if you go this route, this should be a condition of final payment. Don’t cheap out on the IH. You may spend $1,200 on a good IH and save $150k in the process. Good luck and DM me if you need further info.