Near to it are others from Texas. Maybe a group of teens went there and one of them had written a school paper on detectors. "Dallas Rd" means the person had no idea where the real Oswald was currently living. The "l" in "Oswald" is usually developed in other samples by Oswald, but the Museum "Oswald" looks more like "Osward". The other "l"s (as in "Dallas") show the writer knew how to write a "l" properly. It may be that the writer couldn't quite remember how to spell "Oswald".

You mean defectors? ...Yeah, most unlikely there.
According to the timeline....
July 27, 1963 - Lee H. Oswald makes a speech against communism to Jesuits in Mobile, Alabama.
July 28, 1963 - Jada opens at Jack Ruby's club in Dallas.
July 29, 1963 - The Dallas FBI office asks the New Orleans FBI office to "verify" both LHO and Marina's presence in New Orleans.
Why was a verification necessary?