Is there a definitive way to know if a tin can is lined with BPA?
Probably not. Cans are generally marked at point of filling, not at point of manufacturing

The plastic liner looks plastic'y in all cases, it's very hard to tell. Epoxy is harder than other plastics, but there are epoxies that are BPA free anyway

Aluminium cans are more likely have a epoxy liner that will give off a trace of BPA

Many steel cans do not use epoxy or other BPA plastics

Having said that the tested BPA release from a can is 100's of times lower than the recommended maximum daily dose. So in theory there is nothing to really worry about

The common sense answer is, if epoxy dissolved into the cans contents they wouldn't use it would they. The whole reason it's there is to stop the contents 'eating' the can