What do agencies/landlords reference for damages, wear and tear etc if they didn’t take an inventory or photos before you moved in?

We are coming to the end of our agency tenancy in July (thank god) and I know for a fact they didn’t take photos of the property or an inventory because I asked for both several times.

The photos on the site when we rented were from about 3 years before that and there had been other tenants in between. Do they just guess and assume?

Can’t wait for them to try and charge me for scuff marks that were there from years ago.