Best way to dispose of REALLY old canned goods?
My cousin has been renovating the farmhouse for the past 3 years, working his way down from the attic/upstairs apartment (when my godmother was still living on ground floor) down to the basement. He's found all sorts of canned goods - he didn't say how old but I'm guessing over 30 years since my godmother died a couple of years ago at age 90 and wasn't too mobile for the past 15 years or so).
These we most likely BWB (I don't know if my godmother owned a PC) and who knows what recipes were used. He didn't say what kind of food but I'd be worried about botulism - definitely wouldn't eat them but we're a bit worried about even opening them to pour down the drain and then boiling the jars. But is it safe to bring them to the dump to go in a landfill? I'm worried about them breaking on the way, or in the dumping process, and contaminating his pickup, the collection site (landfill is in another town, they truck everything there), or the landfill.
What about boiling the sealed jars and then dumping the contents down the drain, boiling the empty jars and using bleach in the sink?