I'm sorry, but there are currently around 28,000 used items in the warehouse. There can be 20 or 30 identical models, the only differences being cosmetic and/or mechanical condition; there really is no basis to assert that a unit you see onn the website is the exact same one you sent in.
If you really want to help your colleagues, it would be far more beneficial to them if you were to pass on my direct contact details: Helen@adorama.com