LEED Documentation

I just stopped by a prospective clients office to chat about picking up their used or unwanted electronics. The lady I spoke with mentioned they already have a service. I told her that I am willing to pick up their material free of charge (it seems like a lot of "services" charge for pickup which doesn't make sense to me). Then she asked if I could provide documentation as they are a LEED certified business and I didn't have a response. Being in the construction industry, I am vaguely familiar with LEED standards. I don't by into a lot of that eco stuff but I would like their business. It looked like a pretty tech heavy place.

Has anyone dealt with this issue or have any insight? I'm not looking to be certified, I just want to be able to compete with them if possible

Proof that your downstreem is R2 certified may suffice.