According to internet reports, consumers who bought Orange Box from International vendors who aren't licensed in The States are having their games deactivated. According to Consumerist reader Todd:

"Many of us bought the product (and hence, the serial numbers) legitimately online via well known international game stores, as they sell them significantly cheaper than American stores.

We were able to activate the products without a problem.
One week later, Valve, via the Steam program, inactivated all Orange Box games (after they had already been active for some time), stating that they are in the "incorrect territory."
There was no warning or anything, just completely inactivated."

Valve has yet to comment on the reports.

Consumerist: Valve "Deactivating" Customers Who Bought "Orange Box" Internationally