This is what I was able to find on the Sims support website.
QUESTION
How do I retrieve my Sims serial number after I have already registered on the official website?
ANSWER
Unfortunately, you can no longer view the serial
keys you have registered to your account. Please contact support for
any questions about your account since our staff has access to all of
your registration codes. Be sure you have the following information
before contacting support to verify your account and so our team can
provide you with your serial code in the quickest way possible.
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