If you do keep these, make sure to install carbon monoxide detectors in the house (really should be in any house that has any gas appliance).

If you are drinking carbonated beverages you can't even think about good health in my opinion. 

All I got in return for my cashiers checks is a yellow sheet of carbon receipt for my purchase.As I understand it, the title will be recorded within two weeks and I will be mailed the deed along with the refund of the difference I overpaid with the cashiers checks.

(a) Security deposits for residential dwelling units shall be permitted only for the following:(1) The tenant's possible nonpayment of rent and costs for water or sewer services provided pursuant to G.S. 62-110(g) and electric service pursuant to G.S. 62-110(h).(2) Damage to the premises, including damage to or destruction of smoke alarms or carbon monoxide alarms.(3) Damages as the result of the nonfulfillment of the rental period, except where the tenant terminated the rental agreement under G.S. 42-45, G.S. 42-45.1, or because the tenant was forced to leave the property because of the landlord's violation of Article 2A of Chapter 42 of the General Statutes or was constructively evicted by the landlord's violation of G.S. 42-42(a).(4) Any unpaid bills that become a lien against the demised property due to the tenant's occupancy.(5) The costs of re-renting the premises after breach by the tenant, including any reasonable fees or commissions paid by the landlord to a licensed real estate broker to re-rent the premises.(6) The costs of removal and storage of the tenant's property after a summary ejectment proceeding.(7) Court costs.(8) Any fee permitted by G.S. 42-46.Keep in mind that you still have the obligation to notify your former tenant of the status of his security deposit within the required time frame for North Carolina.Gail

With changes in the election and the platform the democrats ran on reducing carbon and sustainable energy there may be some discounts coming in the future.  

In addition I make sure smoke, carbon detectors are working.

Carbon monoxide monitors and smoke detectors are already mandatory in most states and adding surge protectors for devices that easily spark during inclement weather seems like an inexpensive solution. 

Quote from @John Carbone: Realtors should also take note as we head into a downturn here.

Carbon footprint to get them here and the Carbon retention loss to plant them.We own 80 acres of trees and grass. 

Provide a safe and clean space for tenants, take pics when you install (every 10 years) or change batteries on smoke/carbon detectors, have them sign off on a movein doc that says windows open, smoke detectors, test.