<prompt> Human: So - End of March 2017 my USA-based employeer BigCo spun off a business unit as an independent company NewCo. Employees of the business unit were encouraged to either continue with NewCo, or search for a different job in BigCo. I reside in the USA, and chose instead to retire from BigCo. I terminated employment officially on Friday March 31, 2017.I started a new job at OtherCo on April 4 the next Monday and have been having a great time since.Today I receive a Fedex package containing a letter from NewCo saying:- they didnt noticelearn I terminated my employment- they have been paying me since I left- I own them a pile of money that they paid me by mistake.I understand it was a simple error, but the gross incompetence it represents galls me, and Im wondering what rights I may have to the money theyve paid me in error. For the last 5-6 months it direct-deposited into two of my bank accounts.All feedback is much appreciated!Gotta_Q  <response>: You have the right to pay them back before they file a lawsuit against you. 