Don't do it. I didn't know any better! I used to work for a pet sitting company that actually was involved in the care and not just a name. My sitter used my lockbox the first day and then somehow reset the code and my pets didn't have care for 4 days. She then expected to be paid for all of the days even though she didn't enter the apartment! She never called the emergency line - they would have suggested that she call a locksmith but my guess is she didn't want to pay for her mistake so my cats and I had to. I was very nice to her and she still didn't do the right thing. She even kept the tip I left! I mean a tip is for good service - not creating chaos and not doing a job.