A scam?

This guy tried to buy my knife for $100 but sent it in an invoice he said check my email there is something there from paypal but nothing in my paypal yet? he said it takes 3 hours to get there i said wtf its not there he started screaming calling me a scammer

maybe he misspelled your email on paypal or he's actually trying to scam you.
if you want to actually sell your skins, use something reputable like opskins; skins(.)cash; etc. just watch out if your'e using skins()cash because there are a lot of websites that look the same but are scams.

Just ignore these people. They are worth nothing.

you won't be to scammed? Don't buy