mustardoverlordby the way, just a reminder that it is definitely possible to be a cheater who wasn't caught by this
unless you were a) using lmaobox specifically, and b) using it in a certain window that valve focused on, I'm pretty sure you got off scot free
very unlikely, this is not how it works.
If you used lmaobox on X steam account 1 year ago, X steam account will get VAC banned.
The "injection" method you used 1 year ago has leftovers.
Similarly, in the Olympics anti-cheating protocol, they keep the athletes' blood sample for multiple years following their competition.
This is to ensure that, if an athlete is using a drug that doesn't have a test for it the year they compete in, eventually the testing procedures will be improved and will cover a wider array of drugs, and therefore a same sample can pop clean in 2010, and dirty in 2015.
The only way to get away with murder here is to have an alt account and onlyinject the hack while the hl2.exe process is active on this alt account.
In some instances, you can even get even your "main" account linked to your cheating alt and get both of them VAC banned, for example if you shared one game between the two accounts via Steam Family Sharing, if you linked the two accounts to the same phone number, or something equally as idiotic.
Anyone who didn't get VAC banned in this particular wave, I personally feel very safe to say they are completely clean and have never used a hack in their life, simply because lmaobox was so far ahead of any other hacks on the market.
I would go as far as saying other hacks didn't even come close to lmaobox, both in terms of functionalities and quality.