The note is worth $10,000+. Let's not beat around the bush... if that note is what it appears to be, it would be the highlight of any major paper money auction, regardless of whether it's from sheet issue or circulation issue.
"Good overs" from the Bird series are not without precedence. Five dollar sheets with Bonin-Thiessen signatures apparently found their way, years after being printed, into prefix HNB at the end of the series when notes carried the signatures of Knight-Dodge. Given this precedence, it's not a huge stretch of the imagination to see the same thing happening to a misprinted $2 Thiessen-Crow sheet finding its way into the Bonin-Thiessen sheets at the end of the series. Deliberate mistake or not, the note is what it is, and you should only entertain offers north of $10k.