Iphone purchase date

If you are the original owner then go through your email for an invoice you may have received after making the purchase and if you are not, ask the original owner.

For Duplicate Invoice...

Log into Apple

1. Click on the bag icon as shown in the above
2. Click on Sign in
3. Click on Orders
4. Click on the items that you want an invoice for.
5. Click on View Invoice under the Order Number Top right-hand corner. See the pic below...

There you have it.