Resolved

Scammer's profile link: L1T | Sell & Trade Game Items | OSRS Gold | ELO (sythe.org)
Amount scammed: $0, amount trying to scam was $1230
Discord ID + Unique Discord ID: L1T#2923 542297132627918878
Proof that it's their Discord:

Explanation of the trade: Was buying $3000 worth of Empire Coins (his most recent thread).
How they scammed:
Initially, I messaged him on my other discord account. I noticed he was a $300 donator so I was about to go first with the trade and do a half half. He sent me confirmation it was him via PM. However, the unique ID did not match what he had previously posted on another thread.

He then went on about how he knows nothing about unique IDs and has no idea what I'm talking about. I kept trying to get a middleman and even had @ZedRS in a Discord group with him which he still denied to use because he was a "$300 donator".

I then said, okay, you find the middleman because he wasn't happy with Zed, but he just kept going back to how we had a deal I'd go first and that he was so frustrated and didn't want to find a middleman.

Mind you, this is 2 hours into a conversation, it was a big fucking waste of time. I then offered him an extra $50 USD if he found a middleman right then and there and we did the trade. He then proceeded to say it wasn't worth the money, it's about "principal" and that I went back on my word.

At this point, I had enough, I deleted him and never heard from him again. I frequent the CSGO selling, so I went there later that day and found a thread he made selling $4400 worth of CSGO empire coins and the deal is just too good to pass up on (he also mentions in the thread middleman can be used).

I made a new Discord account and messaged him straight away saying I would take 3000 coins and we could use a middleman. He agreed. I found a few huge middlemen which I was willing to pay the high fees to make sure everyone was happy, but he still said "No need to hurry man, least I know who im trusting over 1k".

Once I started to link a few former OMMs and 1500+ vouches people, shocker, he went MIA and deleted me off Discord.

Other relevant trade screenshots:

The first happened on my other laptop, will post screenshots of it later. I think this has enough to warrant a TWC at the least.

The second time I messaged him on a new account: Imgur: The magic of the Internet