funnily enough I don't think it's of any relevance. I just see it that NM was supposed to be at work and didn't want them knowing it was his order, and they probably knew SH or her name. Can't think why they didn't just get a takeaway somewhere else though.
Sorry, I'm probably obsessing on that point too much! Everything is so odd in this case that all the little odd details get me thinking far too much!