Did the ATM issue you wish an aknowledgement slip?
If so, does it have a transaction number on it? They'll be able to verify it by that.
Even if you don't have one - don't panic! I'm sure you're not the first person to have done this! Just get down there as soon as you can and report your mishap. As long as you can describe how much was in the anonymous envelope, I'm sure you'll be fine. Any queries, they have their CCTV to check who was in and out. Put it out of your mind for now, it'll be fine!



