You replaced under insurance, correct? Not Applecare+?
If so, you can't expect a like new phone. Insurance generally replaces the phone but the fine print usually states something like "comparable parts" or so forth.
A replacement from Apple would be a refurb but Apple actually goes above and beyond what they do for new phones in their QC for refurbs. Insurance may "refurb" it but again, you can't expect the kind of device you'd get from Apple.