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jimlongley wrote:I have walked up to a car identical to mine and stuck the key in the door and unlocked it before I realized it was not mine.

My Brother-In-Law's new Dodge pickup key actually works in his son's Jeep Wrangler, but not vice-versa. The nephew grabbed the wrong set of keys one day when leaving from the deer camp and drove off with them. Luckily he wasn't far before he got a phone call to come back and swap key chains. LOL

As for carrying at the Post Office, it will really depend on the location and if it is a real post office or one of the contacted private locations.

This is why when I leave someone in the car, or they leave me sitting and waiting, the car doors get re-locked as soon as they are out. You can unlock the doors for them when they come back to the car, thus avoiding the issue.

Glad it worked out OK in this case.