Can we make a recycling program that will help increase patronage of the US Postal Service?

Will it help if a bill was passed that gave tax breaks to companies that participated in the “postal package system”. The Postal Package System (something I just made up) is a process for companies that ship products to increase recycling and patronage of the US Postal Service. If when one ordered a package from company X, company X included a return label for just the packing materials and the box (taking into consideration that those items are sufficient and do not need to be returned). The return label would be for use through the US Postal Service. This would increase recycling of boxes and packing materials. It would save money and save natural resources. It would also increase patronage of the postal service because all these light weight/empty packages are being shipped back. It will also give people an opportunity to feel like they are making a positive contribution.