loanranger - that is more or less what I am thinking. Some brokers used to let you trade as soon as you handed over certs, but my experience is 10 years old.
Shares sold - long, short, or "oops, delayed" all report on the ticker. The only transfers not shown on the ticker are if I sell you a certificate for money directly and the TA directle effects the trade.
I do NOT know what is shown in various places. Short interest may or may not have anything to do with ftd. ftd means someone did not settle a trade but traditional shorting BORROWS shares available for loan, the borrowed shares being delivered.
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