xH4wks I think (but I could be completely wrong here) that the bank script is private so you can't download it.
If it exist you can probably find it on the forum https://forum.plutonium.pw/category/23/bo2-modding-releases-resources
As for the automatic message you can do that with IW4MAdmin.
If you don't have it and plan on running a public server you definitely should install it