TW0613 door lock

A landlord from 74137 says:
TW0613, 4966399 US patented
I wonder how much for keys that are missing
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Casey from SWISCO responded:

Unfortunately, we do not offer replacement keys. All of our keyed hardware comes to us pre-keyed. You will need to replace the complete door knob set. That said, have a look at our 43-003 and see if this will make a good alternative. 

43-003 : Privacy Knob Lockset
Privacy Knob Lockset
SWISCO 43-003 Privacy Knob Lockset [1080p]
SWISCO 43-003 Privacy Knob Lockset [1080p]
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