Yes, I received a new card in Boquete but only after there had been a glitch with my coverage and I had to be re-instated with Part B. After months of begging I convinced SSA to change my mailing address to the US where a family member can screen my mail and forward what's important to me. The Medicare card sent to the Boquete Post Office took over a month to get there. Good luck!
My spouse and I just stopped by the Boquete Post Office and found 3 or 4 letters each have been there for a while. The postmistress showed us quite a few other social security letters addressed to people with our same last name initial to see if we knew any of these folks with mail waiting for them. We did not but it may be a good idea for anyone with a Panamanian address on file with social security to check with the post office from time to time. My social security check was stopped in June because the proof of life form was returned to the agency and thanks to the wonderful Embassy representative from Costa Rica, this was resolved in a few weeks. Medicare will be mailing out new cards soon so many of us will need to be on the lookout for these as well.