I actually think that they may be wrong on this one. If it was a Squier then even though it says Fender on the headstock you should see "Squier" in small print as well which you are not saying you see. Also the serial number you listed is for a standard MIM Fender made in 1995 and does not follow the Squier serial number pattern. Also Squier manufacturing was moved from Japan to Mexico for a brief time in the early 90's but by 95 they were no longer made there as far as I can recall.
Also I believe that some early MIM Fenders had the one piece pickguard like that. I think that what you have is a genuine mid-90's MIM Fender Standard Jazz. Either way if you like it then you got a good deal.
All the better!
