Lost iPhone in Smyths carpark Tallaght.

I realised I'd dropped my phone in the carpark outside Smyth's in Tallaght when I needed it about 20 minutes later to call for help as I had a flat tyre and was parked too close to the kerb to work the jack. (In the sleet with three unhappy young kids) I called Smyths and they said that a gentleman had phoned them to say he'd found it and would be dropping it back in to the store. I left a thank you card etc in at the store the next day, but it is now coming to the end of Day two and the store he still hasn't dropped the phone back. I'm really stuck without it.