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He can't.

The commonly-accepted answer was provided by Marius, and looks good on the surface. But consider that Kleptomaniacs are smart. Klep Kleppington III -a particularly wily kleptomaniac- could intercept the package and place his own padlock on it and send it back to Mike under the pretense that it is Jane's padlock.

Mike, not foreseeing this kink in his plan, then removes his padlock and unwittingly delivers the package back to Klep, who simply removes his own padlock and takes the ring for himself.

He can't.

The commonly-accepted answer was provided by Marius, and looks good on the surface. But consider that Kleptomaniacs are smart. Klep Kleppington III -a particularly wily kleptomaniac- could intercept the package and place his own padlock on it and send it back to Mike under the pretense that it is Jane's padlock.

Mike, not foreseeing this kink in his plan, then removes his padlock and unwittingly delivers the package back to Klep, who simply removes his own padlock and takes the ring for himself.

He can't.

The commonly-accepted answer was provided above (@Marius), and looks good on the surface. But consider that Kleptomaniacs are smart. Klep Kleppington III--a particularly wily kleptomaniac--could intercept the package and place his own padlock on it and send it back to Mike under the pretense that it is Jane's padlock.

Mike, not forseeing this kink in his plan, then removes his padlock and unwittingly delivers the package back to Klep, who simply removes his own padlock and takes the ring for himself.

He can't.

The commonly-accepted answer was provided by Marius, and looks good on the surface. But consider that Kleptomaniacs are smart. Klep Kleppington III  -a particularly wily kleptomaniac- could intercept the package and place his own padlock on it and send it back to Mike under the pretense that it is Jane's padlock.

Mike, not foreseeing this kink in his plan, then removes his padlock and unwittingly delivers the package back to Klep, who simply removes his own padlock and takes the ring for himself.

He can't.

The commonly-accepted answer was provided above, and looks good on the surface. But consider that Kleptomaniacs are smart. Klep Kleppington III--a particularly wily kleptomaniac--could intercept the package and place his own padlock on it and send it back to Mike under the pretense that it is Jane's padlock.

Mike, not forseeing this kink in his plan, then removes his padlock and unwittingly delivers the package back to Klep, who simply removes his own padlock and takes the ring for himself.

He can't.

The commonly-accepted answer was provided above (@Marius), and looks good on the surface. But consider that Kleptomaniacs are smart. Klep Kleppington III--a particularly wily kleptomaniac--could intercept the package and place his own padlock on it and send it back to Mike under the pretense that it is Jane's padlock.

Mike, not forseeing this kink in his plan, then removes his padlock and unwittingly delivers the package back to Klep, who simply removes his own padlock and takes the ring for himself.