Did you also stop in the gas station to ask if anyone returned the wallet? If it fell off by the pump, someone might have picked it up and given it to one of the attendants. It wouldn't hurt to ask (in case you hadn't).
Galinda didn't often stop to consider whether she believed in what she said or not; the whole point of conversation was flow. -- Gregory Maguire: Wicked
The only time a cold, blank stare is a correct response is when a stranger invites you to get better acquainted with his deity or the contents of his trousers.
----Miss Conduct, Boston Globe Magazine etiquette columnist