3 of the holes did not match so when the fixing screw were fitted, the locking device did not catch so as to lock. two of the fixing screws just spun around in the hole so i had to use a larger fixing ,of my own.there were no spares just exact amount ,no margin for damaged fixings.
the first corner shelve was OK the second one took me hrs to build as all the fixing gave me problems.  i will never purchase another item from wayfair again