RE:RE:RE:RE:RE:RE:RE:RE:RE:day 1 of potential share buy backsyasch, SEDI verification box? Nope, not in my experience.
And share cancellations are noted.
Usually a company will buy back shares over a period of weeks and then cancel the accumulated total in one transaction.
SEDI is the bible, I suggest you learn how to use it.
Over the years, I have posted several quicksheets on SEDI.