Well because this isn't a recall, doesn't seem like Ford would do them for free nor bother to keep track like they are required to do with the airbags. I know my car's previous owner bought the bolts and installed them himself, so the dealer would have no idea.
If Ford did the replacement it will be in their system. If it was self-replaced then hopefully the owners would have kept records. For the OP, if the car sat in a garage for its life and never saw a dealer, then you're safe to assume that none of these have been done.
The difference between a recall and a TSB is push/pull. A recall involves safety and in government tracked. They are generally aggressively pushed to owners who get letters until they do it. A TSB is a "pull". TSBs are almost always installed for free, but you have to demonstrate the problem. My bolts were replaced free of charge very early on. My TSBs on other cars had to be done inside the warranty period...
PS. An axle bolt failure on a moving vehicle seems like it could involve a safety issue, like losing control, but somehow it didn't trigger...
I had to fight with Honda to get a TSB installed past warranty simply because the car was so perfect it didn't need anything done to it during warranty and the dealer was supposed to nudge certain owners about its availability but didn't contact me. In my case the TSB was triggered by uttering the magic words "idle vibration at idle with A/C running". Turns out some bushings caused a resonance through the trans. They replaced bushings on the radiator and trans... I'd just assumed it was the nature of the beast since I'm used to trucks and other cars that aren't silent but my wife found it on google as a problem ...