It's not usually possible for someone other than the registered user of the laptop to unlock it - so best to ask your boss what the password is.
You can understand, that someone who does not know the password of a laptop, is in the same position Antitheft was designed to protect against - unauthorised access.
As it sounds, it is meant to be unlocked only by the subscription holder. You may use the below articles for self help,
Based on the info provided, i suggest you to try from Step 3 in the above article.
Once the laptop is unlocked with the info above, try the suggestion 2 and postback with the details.