lost envelope in dublin, rathmines / ranelagh

lost an evelope to my name, containing a very large sum of money (5.000). since it is what it is, i highly doubt that it'll turn up. trying nevertheless since i need it back urgently and am at a loss of other means to try find it. it's a regular paper envelope used for mailing letters. if you have found it please, please, please contact me. it must have fallen out of my pocket although i am unclear how, probably in the area around rathmines, particularly rathmines road.