Not sure where to post, but I think I just got scammed and lost 75% of my inventory, help??

[Guess My PFP, Win An Item!]

 so this guy offered a trade and brought me to this website. He told me to put some items up for trade ''as a test'', then  a few minuetes went buy and nothign happened. He said all items wouold come back to my inventory, and I needed to complete a ''Scrap TF2'' verifications. There were 3 trades that each had messages: ''Scrap.tf User not verify (7 Items bug) (Need to make a support for the Verification of Ownership and to send all items back) 1/3 (?)'' ''Scrap.tf (Current Verify) (Respond to verify your ownership) (Respond to send back your all items)(Resending all items) 2/3 (?)'' ''Scrap trade(User Verified) (Respond to make a Counter offer) (Counter trade offer to have your all items back) 3/3) final (?) (?)''. Two hours have gone by, and now every item I traded to this ''User storage 26'' have now since been removed from ''User storage 26'''s inventory. The person thsat brought me here (see image) has since gone offline and I can;t get ahold of them. There are literally hundreds, maybe thousands of items missing from my inventory right now. Who do I need to talk to/what do I need to do?

[Loki, The Zoroark]

Scrap staff (and any respectable website's for that matter) will never personally contact you asking to trade valuable items for "verification"

[Smidge ♡]

essentially the same thing happened to me a while ago
i definitely learnt my lesson