yeah i probably purchased from the guy you assumed was a scammer haha. he had like almost 20 positive feedback so i figured was worth a try. oh well. i have yet to have a successful grailed purchase. what a huge waste of time that website is.Yup thats how it works. I had the same thing happen to me for a pair of Supreme 5s. Good feedback, etc. probably fake. Its just the nature of grailed. You can find steals but you have to be willing to have your money tied up and dispute as well. At least its paypal so you can have confidence.
Are you a size 10-11 by any chance? I dont use grailed much anymore but i did see a pair for like $450 while scrolling a week or 2 ago. I automatically assumed they were either fake or it was a scammer. Good luck with your dispute and future purchases