Chime sent me a check and I don't know why? Or for what?

So I closed my account with chime in Jan Feb this year and I had a zero balance. So I'm not sure how or what but I just received a check from them dated the 28th of Aug this year. The check has no info and all no memo no explanation period. I dealt with chime for a long time. Long enough to know if they sent me a check and it had no info I need to get to the bottom of it and fast else I'm gonna be loosing some money. That being said their wasn't any kinda government tax money or any like that scheduled to go out or anything like that because my tax return did go to chime this last year. I'm not sure I'm just throwing things out there. I'm calling customer service now but wanted to see if anyone else didn't happen do get a check or some money via chime at the same time as I did or if anyone has any idea what this might be for I'd appreciate it if I can get filled it to