The best way is that you say to Fedex you want to go to meet custom near airport nd u want their staff to be with you. Be polied nd nice with custom or FDA and there is a good chance they will release your parcel if no medecine inside but you can abandon these. All other options is a waste of time. I just spent 3 months with similar case with UPS bangkok and overv200 emails. All was solved when i went to meet in person custom nd fda. You will loose
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day but you will get your parcel.