Treasure Hunt.....not

I got home from work to be greeted by my parents and was quickly told that our French door keys were missing. They had looked all over for them but to no avail. So, for the next 3 hours & 20 minutes Gail and I pulled the house apart. We questioned the boys, checked with our neighbours that they hadn't been left in their house, but nothing. Gail and I always check that the door is locked before we go to bed, we both swore that the keys were in the door last night.
A phone call to my father revealed that he had visited our house this morning to check on his plants in the greenhouse and that he had gone out into the garden through the French doors. "So what did you do with the keys"? I asked,
"I can't remember" was his reply. When all comes to all, he walked along to his garage, checked inside his car and found them in the drivers side doorwell.
Panic over & a wee dram to chill.