I received $104 in the mail with no return address?

Today I got $104 dollars in the mail, with the only return address being my city (in texas) and a zip code, that has no relation to me. My friends and family don’t know anything about it, and it included my full first and last name on the envelope when they sent it. The money looks real, and was “wrapped” in some paper with no information on it. The only info I have is the return address’ zip code, and that they know my full name. What is this?