see apple device purchases
how do I view my past apple device purchases
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For items from the on-line store go to apple.com, scroll to the bottom, and click on Apple Store Account. --> https://www.apple.com/us/shop/goto/account (only the past 18 months)
For a physical Apple Store purchase you can try contacting the store where you purchased the phone and see if they still have a record of the purchase.
Apple recommends you "Keep your receipt after you buy an Apple device" --> https://support.apple.com/HT202711