Here are the 12 lowest volume days in the last 5 years.
There are 12 rows because this list includes half-days that are excluded on the reddit list. Specifically, edgar510 doesn't include the two crossed out days which I believe are thanksgiving and july 4th-related half days. See NYSE holidays and trading hours.
The data is from yahoo finance and dates are in ISO format (YYYY-MM-DD).
Historic pricing can be downloaded from yahoo finance. Either by date range or as far back as the stock was traded. I'm on my phone else I'd do it for you.. But I'll be back to the office after lunch if you need it still.