"I didn't receive a 5498-SA for TY 2016 during 2017 because my account wasn't active until after January 31, 2017."
The deadline for filing Forms 5498-SA is May 31, not January 31, so that's not an excuse. You should have received the 2016 Form 5498-SA by early June, 2017. It's good that they are sending you the missing form.
It still might be worth obtaining your 2016 Wage & Income transcript to see that the 2016 Form 5498-SA was properly reported to the IRS.
