Open Question: Mail Was Opened by Employer?

I sent a package to my boyfriend's workplace, and when he received the package, the DVD was taken out of the packaging. It was an anime DVD- luckily, no porn...well, I was/am rather annoyed and bothered! The package was made out to HIM and had the company's name and address. Um, I thought it was illegal to open someone else's mail...Does the law change within the workplace? Please help!