Lost IPhone 5 white in taxi. Transparent bumper case.

Hello everyone. I lost my IPhone 5 ( White ) in a cab going out to Bayside in the early morning of Saturday ( 3am-4am ). It has a transparent bumper case to protect the edges. The Guards Lost and Found have been contacted. The phone is turned of and can not be located. I have little hope that I will turn up again but I offer a generous reward to anybody who returns it to me. Thanks for your help.