u/OSMC_022

TLDR landlord lost the keys to the house they own due their own negligence. Will we responsible if they decide to charge us?

So we moved out back at the end of March due to the house being unhabitable and the landlord not repairing the water boiler. When we moved out we left the keys (the original keys plus the copies we made) in the mailbox for him to pickup. A few days later he messages about wanting to pickup keys and we tell him they're in the mailbox. Flash forward to this week (April 27) they call saying the keys weren't in the mailbox and ask if we still have any remaining keys because they don't have them on hand. We tell them we had surrendered all the keys and that it was their problem. Today (April 28) we saw a locksmith van outside the house since they had to get the house unlocked. Are we liable to the repairs if the landlord is petty enough to bill us?