Did He say the bread is a "symbol" of His flesh, or did He say it is my flesh?

No but He did by using those metphors shew, declare, speak of or teach us what they point to as a metaphor used in parables, always does.

Three guesses for you as to what they do really shew, Had2 .Or is it not a dead body they showed at all but mystically at the sound of the sacred grace inferring little golden bell they really become dead flesh void any spirit life ?

What does the Lord's death shew other than the work was done and nothing could be added to it or taken away from it?

1Co 11:26 For as often as ye eat this bread, and drink this cup, ye do shew the Lord's death till he come.

2605 kataggello {kat-ang-gel'-lo}from 2596 and the base of 32; TDNT - 1:70,10; vAV - preach 10, show 3, declare 2, teach 1, speak of 1; 171) to announce, declare, promulgate, make known 2) to proclaim publicly, publish 3) to denounce, report, betray