..Naya_zay..
Not sure how far you've tried looking into this matter, without paper receipts; or bank/card statement..?
You may be able to estimate more exact (or not) depends heavily on other records, outside your control.
• Check Your Service and Support Coverage - Apple Support
//checkcoverage.apple.com
This says:
"Review your Apple warranty status and eligibility to purchase additional AppleCare coverage."
And gives a 'captcha/code' kinda place to enter the product Serial Number; there's that much.
..Warranty status, probably is Expired; but could show some dates, maybe..
The Apple Store may not have records of a purchase; but a user often has.
[Fiscal records; maybe kept with original box? I've done that: found an old box in good shape
and looked inside, to find the original receipt, booklet, advertisement; just a minor fixation?]
