Transfer these files to you new MacBook Pro. On that MacBook Pro choose File -> Import Mailboxes in the Mail application. In the Import window that appears, choose Mail for Mac OS X and click the Continue button. In the resulting sheet, select the folder that contains your mailbox archives and click Choose. A list of all the mailbox archives Mail is able to import then appears in the window. Uncheck those you don't want to import and click Continue. Mail will go about its business of importing the archives and will place them in an Import folder under the On My Mac heading in Mail's Mailboxes list. At this point you'll want to click on each mailbox to see what it contains and then rename the mailboxes to accurately reflect the account they're linked to--AOL Archive, for example.