Call the police to report it. You may need the documentation for the doctor, insurance and/or the pharmacy which has to document filling a controlled substance early for the DEA & State authorities regulating controlled substances. It's also quite possible that the police can get the medication back for you as they can verify with your doctor that the medication was legitimate and remind the TSA that they seized a controlled substance that they don't have the authority to have in their custody beyond arranging for its destruction or passing to law enforcement for prosecution.
Lastly, 260 capsules of APAP+Butalbital+Caffeine+Codeine should run around $120. If you need a Pharmacy Discount Code look at Goodrx.com for pricing where you are. You should also followup with your insurance company about reimbursement as the product was taken from you and not "lost" which is why the police report is important.