.Gov citation would have you believe differently:
When you have opened a can of food and you're not using all the food straight away, empty the food into a bowl, or other container, and put it in the fridge.
Don't store food in an opened tin can, or re-use empty cans to cook or store food. This is because when a can has been opened and the food is open to the air, the tin may transfer more quickly to the can's contents.
This advice doesn't apply to foods sold in cans with resealable lids, such as golden syrup and cocoa."
taken from: Food Standards Agency - Eat well, be well - Storing
and though I agree that the laquer inside the tins will go a LONG way to prevent harm, there was Not information posted by Anyone to say if it was or was Not treated this way, and Thus my advice was to Remove it.
and can you Always be sure you didn`t scrape any off by accident?
it`s like pork, many of the nasties have been "eliminated now" but I still wouldn`t eat any that was under cooked.
I`m Old School I guess (yet another Flaw of mine).