Elizabeth, I am certain. Last year, my eldest was a senior in HS. I sent her SAT scores and you could definitely choose which test dates to send, but could not choose to send just certain subscores.
For the ACT, it is the same. You can send the test dates you want colleges to see, but you can't mix and match your subscores from different dates. A few colleges do superscore the ACT, but that is on them - you can't send selected scores to reflect a superscore.
That being said, some colleges do require all scores to be sent. There has been discussion on this elsewhere, but the college may be able to see that you took the SAT on a certain date, but did not provide a score (as in a test date with blank score section on the report).
If he qualified for SET, he used the code to send his scores to CTY. They are "on record" somewhere. I recall a login for CTY and I could see my kids' scores after College Board had wiped them out.
Sorry, I still vote wipe them out. His score in HS will be fine. Eldest had a friend that scored 2100+ in 7th grade. Didn't keep his scores and ended up with two perfect sections, other near perfect on his HS SAT.