an ironic lost and found

Having thought I left my wallet at Agata (a local grocer where I shop most days), I go in, just as they are about to close, and ask.

"I don't think anyone's turned in a wallet today. But I'll check," says the manager.

He opens a cash register (used only by managers) and says, "This is where it'd be if we had it."

As he's rummaging around, I see something that looks exactly like my keys.

I bought this for the express reason that it would be hard to misplace, and easy to see in my purse.

"I think that's mine," I say, pointing to the pink fluffy set of keys. I doubt anyone else would have a key ring like that. And now that I think of it, I haven't seen mine in a while (I have several different types).

So the manager hands me the keys, but concludes that my wallet is not in the drawer.

I get home, open the door with my "new" keys, and see my wallet nearby. 

What are the odds that I would go to a store looking for something I thought I'd lost (but hadn't), and return with something else that I had lost (and didn't know it)?