"was not aware until" is correct and usable in written English.
You can use it to describe something that you only became aware of at a certain point in time. For example: "I was not aware that my flight had been delayed until I arrived at the airport."
"I was not aware until now, two days later, that you claimed to have been assaulted.
He had lunch Friday with Rodriguez, who was not aware until he got to the park that Rivera had said he would make a comeback.
I was not aware until today that you could study Advanced Sandcastles, but apparently you don't graduate until you can make a MOAT.
I was not aware until now that the validity of disciplinary bodies' decisions depended on the celebrity status of their members.
"I was not aware until these recent months of the allegations against him from as early as 1966," the cardinal said.
I've seen a lot of this kind of artwork in recent years, but I was not aware until seeing this show of just how many artists were engaged in this kind of thing.
I just wanted to play par golf or better on every hole, and I wasn't aware until I was walking up to the green.
"I wasn't aware until our team manager sent a message through the 12th player that I had broken the world record," she recalled.
"I wasn't aware until I came to the city that San Antonio and Spain were so linked, but I have learned a lot about our common roots," she said.
He wasn't aware until a reporter informed him that he nearly recorded a quadruple-double last night: 21 points, 10 assists, 20 rebounds and 8 blocked shots in 46 minutes of play.
I thought, 'Oh, no.' I wasn't aware until the movie came out and people would stop us and ask complicated questions about the properties of krypton and I had no idea what they were talking about -- well, at that point, it dawned on me this was huge".
