Facebook - viewing hidden posts as page admin

[AmIAWeed]

Long story short I run a community Facebook page, We have zero tolerance on bad language and bullying so when one person became particularly vile I blocked them.
When I banned them from the page all their comments became hidden, however I didn't take screenshots at the time and I really should have, I now need this.
How can I get this without un-banning them and making their comments public again?

You have to unblock them, do it at an unsociable hour to minimise viewers then search their name and screenshot the relevant comments then block them again.

I’ve done this as I couldn’t find another way.

I think I set an alarm and did it at 3 in the morning!

Thanks @Soola, is there a restriction on banning in the same way there is blocking?
They never liked the page so I had to unblock them on my personal account to get their Facebook ID, and edit the code to ban them, absolute faff...then I was stuck with that person for 48 hours until I could block them again.
I'd hate to unban and have them be able to access/view the page for 48 hours

Sorry, mine is different as my groups are just private groups so I can block them or just kick them out.

As sole administrator only I can add them back in.

I don’t know if this has more info

technical.sabhlokcity.com/2011/09/facebook-blocking-option-not-the-best-way-to-deal-with-a-problem/