I'm trying to find such questions so that they can be promoted and resolved in my new Area 51 proposal: Area 51 Proposal: Finance (including Corporate, Public Finance).
Questions that are closed here as off-topic have a limited life span. Eventually, they get deleted, either by a moderator performing a cleanup, or when a sufficient number of high-rep users vote to delete each such question.
Consequently, most of the off-topic questions you're likely to find here will be more recent ones that haven't yet been purged in either of those two ways. Many hundreds more have already been deleted.
If you want to find closed but not yet deleted questions, you can look at this query: "closed:1". However, the results aren't limited to questions that were closed for reason of being off-topic. Except for those labeled "[duplicate]" in the title, you'll need to look click through each individually to find out the more detailed close reason.