I need to recover the serial number of the old iPhone 6 to prove I owned it under the settlement agreement.

Can Apple provide the serial number for my iPhone 6 that I recently replaced with an iPhone SE? I want to make a claim under the settlement agreement but I did not keep my iPhone 6 serial number when I sold it to itsworthmore.com but their form did not require the serial number. I did have apple replace the battery during the slow down controversy so they should have it at that store, maybe? Thanks, Bob N.

[Edited by Moderator]