24 hour notice for a *single* entry is significantly different than a lock box that any random realtor can access and enter a property.
Ever see that listing that says "Do NOT disturb tenants"? Some just don't like it.
You did have a preliminary and final walk-thru in your agreement? If not, there are plenty of examples around, or invest a few dollars and get one done professionally by a Cali lawyer. The time spent in small claims court (that's where any of these will be heard) is worth the investment.
I've done pictures/testimony on more than a few cases for my dad/family trust after the walk-thru. I'll tell you the only way you can stick a tenant with the price of the carpet replacement is if it is less than 1 year old. Everything else is normal wear/tear and on your dime.