I hate to say it but I usually place myself as a classic user. Who actually RTFM in the real world ? and actually, should I still need to RTFM to use... a phone ?
First thing I ever do is throw away the instructions.
A bit surprised by what you say considering how tough my Z10 is maybe the person assembling it ran out of glue, considering how well bbs are normally put together I expect this is a one off.
No excuse because quality control should spot this , signs of past shoddy management.