help! engine seized on toyota

A&Q about 350Z
Q:

I bought a used car about 20 days ago that was supposed to have a rebuilt engine/transmission....and it actually purred like a kitten...no smoke coming from oil area/no pressure at all...absolutely no noise.
it has been about 750 miles of hwy miles since purchase, and all of a sudden it locked up on the hwy. Dead.
There was transmission fluid on the ground before towing and at repair shop right after.
Transmission was serviced less than 8 days ago by the seller, who also was the one who "replaced" the engine/transmission with one from salvage/wrecked car....
Is it possible that in that short period of time, with no existing problems/leaks that were evident, that a car this old could have used all of it's oil reserve and run out if it hadn't been checked since purchase date 2 1/2 weeks ago?
It appears to have no oil in it, but I don't know if the repair shop drained it before/at diagnosis time....?
A:

idk what to tell you...isn't there some sort of lemon law in your state?? The only thing i can think of is that this guy spun a rod bearing and did a crappy job fixing it just so that he could sell it....the car will last for less than 1000 miles before it clunks like crazy and seizes.
A:

spun a rod bearing? what does that mean in dummy language?
He has the car back, and hopefully will give us another...but if he is doing crappy repair work I don't know if I want another...?
A:

OH YEAH, thanks for your reply
I wasn't being sarcastic towards you; I just don't understand what you said
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