I sold so many sets on ebay to 0 feedback buyers, including multiple addresses in FL. No backfire so far. In my past limited experience, I found a lot of south america folks like using address in FL, where asian & europe buyers prefer address in OR / DE.
Anyway, if I were you I would send the package but will choose UPS / FedEX over USPS since they are more reliable. If you are still concerned, add signature. As long as the tracking shows delivered, you are off the hook and ebay will deal with the issue if any pops up in the future.