Down and Dirty tutorial for Opening a Supra Lockbox. I hope this helps any new realtors showing their first property . I remember when i first became a Realtor, I registered to have access to use the supra app but I never had a chance to open a Lockbox. A team member asked if I could Open Door for his clients near my area one weekend. I was happy to help, an eager new realtor showing his first property. I was so embarrassed when i got to the property because I wasn’t sure how to Open a Supra Loc