Okay,
Well I swapped it in and initial testing reveals that it now starts first crank every time, instead of immediately on very first start of the morning and more difficulty/cranking throughout the day AND it's not building gas tank pressure anymore. So I'd say that I got what I paid for and probably bought myself between 60K-100K miles...time will tell.
This used one I bought off eBay was from a 1999 Lexus LX470 that was built 10/98 which is within 30 days of when mine came off the line and the seller claimed the Lexus had 171K on the odo so at this point I have no reason to think otherwise.
So I guess my advice at this early juncture is if you're going to buy used, pay a little more for a seller with great feedback and who states the miles on the used part, trying to get the lowest mile example you can find.
It'll still be a little bit of a crap shoot as to whether the part has been flooded out with gas or not.
Edit: The eBay seller of this item was toyspowersports and has a rating of 99.3% with 61K items sold.