or is it a concern that potentially dangerous tins are being sold?
I think that should read potentially dangerous tins are being bought.
If people want to chance it, up to them, they are not being forced to buy
We had a boat salvaged down this way and they sold off all the tinned stuff in an auction, salt water made the tins rust but no problems with the contents, apart from no labels, I had to check that there was not a dog on board before I ate my tinned steak. My mate paid a fortune for peas which he swore contained tinned peaches as he caught a glimpes of the 'pe' in the washed off labels.