Moen Kitchen Faucet Model 87017 (Wolfe & Reed)

Used, but in excellent condition: No scratches, all parts present, no leaks. It is packed in the box of the faucet that replaced it.
This has been in use for 9 years with softened water and a whole house filter that removes chloramine.
Why was it replaced? There was a leak under the sink, but it was only after the faucet was replaced that it was determined that the leak was due to the drain, not the faucet.