Who called from 3346259784

They contacted me n sent check with extra funds telling me to send money to shipper to pick up my item that I'm selling. Using the name James Smith.

This is a scam. The check is no good and if you cash it, you will be charged a fee by your bank and be out any money you sent. You can take the check, envelope and any instructions that came with it to your Post Office and have it investigated as mail fraud or take it all to your bank and have it investigated as bank fraud.

Take the check, and the envelope in which it came, to your postal authorities.
They will investigate "using the mails to defraud".

Thanks

It came via UPS