There was BPA in the white coating on the inside of the Ball lids. Kerr did not have that. Same company, though, makes Ball, Kerr, and Golden Harvest. I think that is who makes the generic ones in bulk from Lehmans, too.
There is no formaldehyde that I am aware of in the standard lids. Just the Tattler when exposed to heat.
The peaches would have been safe if put in the fridge, frozen, or reprocessed within 24 hours of the initial processing. Fruit you won't get botulism from. It would just mold or ferment after a while. Not unless it was REALLY moldy and the ph changed over time.