I was scammed a couple of years ago into sending my CS:GO skins to an account without ever receiving a payment. Now, at the time I thought I was well versed in the art of the scam, and would never fall for something like that, but this was something new that I hadn't seen before.

The scammer contacted me on Steam, and asked if I wanted to sell my skins. I was weary at first because it sounded like an obvious scam, but I delayed him for a day and he stayed with me, no matter how much I tried to lengthen the time. Most scammers leave after a couple minutes if you mess with them, but this dude stayed up nearly 24h with me. He had good english, something that's rare amongst CS:GO scammers since most are Russian. And the guy offered to go first, sending me money over PayPal before I sent him the skins. But instead of the money, he sent one of those requests where he has 21 days to cancel the transaction before I received anything. I didn't know that was a thing, since it was apparently a near feature and hadn't gone popular in the world of scamming yet. He sent me a request that showed +$120 USD in my PayPal, with my PayPal balance still at 0. I sent him the skins, because I thought it was real, and he blocked me. 18 days later he canceled that transaction. PayPal refuses to help with these cases in getting the other party the money because they claim the credit card linked to the account that he sent me the money from could be stolen.

All in all, don't send any items, whether they be physical or not, to someone unless you have received the money and see your PayPal balance at the number it was before + the new money. If it doesn't show the new money, don't agree to the transaction.