Sending a fan letter to Adult Swim

Hey! Apologies if this is annoying to ask (I straight up don't know where else to ask!) but I sent a fan letter to Adult Swim, to their 1065 Williams Street address in Georgia months ago. Was this the right address to mail it to, or did it just go to dead mail? Ive been very anxious about wehter it got there or not. I dont care abt a response(They are not obligated to and I am OK with that.) I just wanna know if it even got there.

And related- if any of you have ever mailed a letter or anything to Adult Swim, comment your experience! Something ive always loves about AS is appreciation and communication with fans. It'd be awesome to see some of that.