Checking the date when an IP was blacklisted? (Email related)

Hi.

Is there a way to check the date when an IP has been blacklisted?

I've got a few IPs listed in Spamhaus and I'd like to check when this happened so I can understand whether the blacklisting has been caused by a customer of mine or it was blacklisted before they used those IPs.

I have monitoring set up on other IPs but it happened that I didn't set up monitoring on this customer's.

Thank you.