FYI, I’ve bought a lot of refurb stuff over the years and the only time I’ve ever had an issue is with refurb Mophie battery cases. We tried three and not a single one survived long (two actually came apart with batt swelling into air-pillow like shape).
(Have had no issues w/ new Mophie cases other than minor, such as eventual connector failure)
It won’t work. I use one for my 6s. The top portion slides on and there is a small slit cut out for the lense of the 6… you may be able to bend it to work with the 7 but i wouldn’t. Hope that helps.