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Their move in checklist said that there was a $5.00 charge for any key not returnedI add that any accidental lockout, loss of keys, or requirement for locksmith services is the tenant's responsibility.

(My locksmith had to settle for a bottled Margarita which, as we all know, is not worth consuming unless it is made fresh.)

The U-Bolt has a key core inside the smart lock cover that provides back up entry by key, so I would have a locksmith change that lock between tenants.

Takes me an hour and $35 to remove all of the locks, take them to a locksmith for new keys, and reinstall.

A locksmith set me up with 5 different locks that I can rotate and my master key will open all of them so I only have 1 key on my keyring that opens all properties without searching for the right key.

The dad tried unsuccessfully to “help me out” by using a giant kitchen knife to attempt to break my door open so I didn’t have to wait for the locksmith.

Don't do it unless they pay for it and have them pay when the locksmith comes, not with the rent.  

If you keep the model and Key number, you can buy or have the locksmith key to the same Key.

In my property class, with my limited number of properties, and since I'm my own handyman/locksmith, going through plenty of new deadbolts available at any Home Depot or Lowes makes more sense for me.That being said, yes, I try to hold on to old deadbolts and move them to other properties, but often that's just too much work for me.