@CBeckFJ As others have stated, I've never heard of Toyota frame recall for the 100 series as they were all built in Japan. The bad frames used on the Tacos and Tundras were built in the USA.
Anyhow, I've seen the Ad of the LC you're talking about. The owners live in Lexington which as you probably are aware is a very affluent town. So, if they bought this one new they probably have the paperwork to document the frame replacement. HOWEVER, even if it was replaced in 2009, it's been on Boston roads for the past 10 years so it will be crusty underneath if they didn't do anything to treat the metal. Still probably in better shape than yours. What's troubling is the mention of rusty bodywork and stuffing of bondo.
Take a close look at this one and get a PPI done. The local Yota dealer in that area is known for ridiculously high repair quotes so I would schedule a PPI with them and use it to negotiate with the seller. Good luck - let me know if I can help - I'm only about 20 min from Lexington.