I haven't read every single post on all 24 pages so I may be asking something that has already been asked and answered.
Are you trying to hatch one lone chicken egg? Are you sure it's a chicken egg and not a duck egg? Are you positive on the dates? For it to be day 27 that would mean you put it in bator on Sept. 1st.
If all of that is true - chicken egg, day 27/28, I too would poke a hole in large end of egg, peel away a tiny bit of shell and take a peek inside. I'm not understanding how it could be wiggling all this time but not peeping.