Found this but Verizon should have a record of this... http://www.verizonwireless.com/b2c/findDeviceId/helpOverlay.jsp?pageName=basicPhone.... They should know if the phone is yours... BTW who is asking for proof?
If you happen to have the box the phone came in, it should also have the MEID number of the phone listed on the box.
I'm most definitely NOT a VZW employee. If a post answered your question, please mark it as the answer.
We want accessing your phone information to be easy! Please accept my follow and send me a Private Message and I will be more than happy to locate your previous device ID. Have you reported the device as stolen?