One word for "stealing something on its way to the recipient"

Solution 1:

You could use intercept.

From ODO:
obstruct (someone or something) so as to prevent them from continuing to a destination:
     intelligence agencies intercepted a series of telephone calls
     I intercepted Edward on his way to work

Solution 2:

Besides already-mentioned intercept, consider waylay (in sense “To accost or intercept unexpectedly”) and hijack (“To forcibly stop and seize control of some vehicle in order to rob it or to reach a destination”), and also the verb to pirate.

Solution 3:

You might consider purloin, which involves a breach of trust. Otherwise, there is no exact equivalent for what you want.

Businesses usually call losses during the transport of goods pilferage.

Solution 4:

I was thinking of to snag but that is perhaps not a proper word?