Some questions were answered. New ones arise:
"Please exchange a spare circle for the meeting"
Should I stop using these blades until I understand the meaning?
Would I suffer blade spills that can damage my skin?
Why is the spare blade coded for approach? And how?
First razor blade packaging that I've seen which comes with a complete set of riddles; similar to those that appear in fortune cookies or Christmas crackers (but probably not those from Fortnum's or Harrods).