You will need those letters. Also kinda curious if the landlord is the one who has an issue and is trying to deflect with some bullshit? You will know soon enough if he/she can not produce the letters. And if the landlord was the one to take the pictures you can press charges against them for not providing you with 24 hours notice they would be at the property for inspection. Only caveats to that are emergency repairs or request.

If the vehicles is on private property you do not need it inspected or insured. Only if you take it in public roads. Check the ordinance language.

Then press charges for trespassing on whoever came into your property and molested you possessions uninvited.

This post could very easily be moved into malicious compliance or petty revenge if you do that! Lol.