Migration assistant can't find backups on Time Machine drive that contains backups from multiple computers

My Retina Macbook Pro died due to a hardware error. During the diagnosis I was asked by Apple support personnel to format and reinstall OSX, which I did but did not fix the issue. The mainboard has since been replaced and I am trying to restore the TimeMachine backup I have.
The USB disk containing the TimeMachine backup contains TimeMachine backups for two different computers, my last Mac and the one I owned before that, which died earlier this year.
When I plug the drive in, I am able to browse the backups from both machines, as shown in the screenshot below.
The problem comes in when I attempt to run the migration assistant. I select the first option (restore from USB drive, etc). The migration assistant finds the USB volume and in the list underneath shows backups from a single computer - which it calls Unknown. The date of the last back is shown as 10 December 2012, the same date as the last backup from my old Mac (doolittle). There is no trace of the backups from my new mac.
Any ideas of how to get around this?
Thanks
Andrew

http://pondini.org/OSX/MigrationProblems.html

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Since no one replied I figured out how to do it myself.
1.) First I plugged in my external hard drive with my Time Machine backups on them, then I opened Finder and click on my external hard drive under devices.
2.) Next I clicked on and opened the folder named "Backups.backupdb"
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4.) Inside that folder, I clicked and opened the folder named "Macintosh HD"
5.) Inside that folder, I clicked and opended the folder named "Users"
6.) Inside that folder, I clicked and opended the folder named "Daniel" which was my Username on my previous Mac.
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franz1 wrote:
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Dear MrHoffmann
Maybe it is because I am foreign, that I don't understand correctly, and for that I am very sorry. I can't imagine what a restore of a Time Machine disk is then. And I tried to find out what a scratch disk is, and the online computer dictionary told me it was an external HD, with a space for not permanent files. Maybe I misunderstood that too. Where do I then perform a restore of the backup? And where am I told if the disk is vail and bootable... sorry for my lack of understanding. As I understand I am not able to boot from a Time Machine backup, at least before Lion, and I am talking about Snowleopard. And I am not able to understand Install logs. This just sounds too difficult and far beyond what I am cabable of with my skills. Sorry.
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https://discussions.apple.com/message/20154303#20154303

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Migration assistant can't find backups on Time Machine drive that contains backups from multiple computers

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