I believe the settlement period for securities is 3 days from the date of the transaction. If this does involve a Failure to Deliver, this will be a new experience for me. Pinkies don't fall under REG SHO but this is what I found. I'm not saying that this is/has happened, so take it as an educational tidbit. lol I believe Pinksheets.com has a "Threshold List"....somewhere.
"FINRA Rule 3210 defines threshold securities as any equity security of an issuer that is not an SEC reporting security and, for five consecutive settlement days, has:
aggregate fails to deliver at a registered clearing agency of 10,000 shares or more; and
a reported last sale during normal market hours (9:30 a.m. to 4 p.m., ET) for the security on that settlement day that would value the aggregate fail to deliver position at $50,000 or more."