Which License is attached to which computer

[REDACTED]

I have three separate licenses for Avast. One is a single computer license and two are 3 computer licenses.
I am replacing one of the old laptops with a new one.
How can I tell which license goes with the old laptop so I can use it to activate Avast on the new laptop.

Thank you

[Eddy]

If you didn't bought them on the same day, the expiration date should tell you.