Chie and Ty talk about all types of things that will find their way into your mailbox in Japan whether you like it or not. This includes countless チラシ, or flyers, and other things like magnets and bills.
There are also good things, like 年賀状 nengajou, (New Year's Cards) too though!
Don't wait for the NativShark チラシ and sign up with this link instead to get learning Japanese:
Show notes: https://www.nativshark.com/tools/using-nativshark/lbjp-chirashi