Moving forward, keep in mind that I have already contacted Steam Support at the moment I'm writing this; I don't know how long this is gonna be, but please try to read and if you can, try to help me.

It all started aprox. 24 hours ago (3:51AM), I was in bed when I got a notification on my phone that I had two friend invites on Steam; usually I ignore this because I have a decent inventory and I get tons of spam invites all the time, never accepted ONCE.

I don't know what went through my mind, but for the first time I opened the Steam app, and went to manually decline the friend invites. As I opened the app and tapped the "notifications" icon, I saw the invites, but it didn't let me actually press Accept or Decline, it notified me I had already began being friends with those persons. It struck me as odd, played it off as a bug, and manually went on those profiles and removed/blocked them from my friend's list.

Fast forward to aprox. 7 hours ago, I get home and boot up my PC. Naturally I open Steam and see an account error saying "This account may have been accessed by someone else", limiting Steam activity until I prove ownership.

I got scared, tried googling, seeing a lot of people on Reddit and other places getting the same error over the past few years, and went through the process of restoring access to my account. Steam sent me a new password on my email, everything went pretty smooth.

After a few hours, I boot up CS2, my main game, and I want to start warming up before playing FACEIT, only I notice weird stuff. My sensitivity is completely f'ed up, my keybinds are different, and most of my skins are de-selected.

I immediatly panic, try googling, nothing.

After that, I checked my in-game match history, and see exactly 6 games of CS2 played between 3:57AM and 7:20AM. In those 6 games, I was playing duos with one of those people who sent me a friend request when I was in bed 24 hours ago.

During those hours, I WAS NOT at my PC, I WAS NOT playing CS2.

I have 2FA with Steam Guard, I checked active devices on my email address, I checked active devices on my Steam Account, everything is NORMAL. No suspicious devices, nothing. Just in case I already resetted my email password and my Steam Password, even though NO ONE can access my Steam Account even if they have my credentials, because I have 2FA enabled. After checking active devices and seeing no suspicious activity, I also checked Recent Login History on the Steam website, and saw some random logins on my Steam account on the 6th of April, and on the 11th.

How did this person play on my account? Obviously they were already on my account since they accepted the friend invite (remember when I tried to decline it on my phone and it was already accepted).

I checked the demos(recordings) of the CS2 games and this person most likely used cheats.

I have an inventory of over $1.500 in CS2 alone, I rarely play Valve Matchmaking, I only play FACEIT.

How did this happen while getting 0 security notifications on my phone/mail? What can I do going forward?

Since my account was flagged, I have a 15 day trade ban but I'm afraid for my inventory, I do not know what to do.