If there are screws still poking back out or the screen not sitting flush, bring it back in and we will sort it. I wouldn't give a handset back unless it was in the exact same state as when it was given to me.
I was in the Apple store @ Braehaed just outside Glasgow, booked in my misses' 64gb 5, battery issues and it had the screen flicker, the 'genius' tested the phone, the screen was playing up when he tested it, yet he resorted the handset to factory settings, said go away and try it again, any further issues, bring it back in, ehh ok mate, so away we went, the phone was doing the same thing within an hr of leaving the store.
I called apple care, the lass on the phone took the details, then emailed it to myself with a reference etc which I took to the store and spoke with the 'manager' (bit of a jobs worth) with bad breath tbh, he challenged what the apple care advisor had said and was questioning replacing the phone, so after a further 10 mins of explaining the issues with the handset he finally decided to give us a replacement.
Needless to say I won't be back at Apple in Breahead, the store in Edinburgh and Glasgow city centre are far more customer focused. For example my MacBook Pro is now over two years old, I was in the Glasgow store with issues with the charging port - MagSafe not responding when connected, they gave me a new adaptor off the shelf, no question.