$100 to receive a letter? Unless you mention more details concerning the code and its purpose, you might not get any positive response.
Don't understand.
You saying that $100 is a little or a lot?
This letter contain a verification code that you should tell me.
I need this code for verification on a site.
$100 is too high and hence people did not reply as they found the deal too good to be true. People don't share their house address usually to unknown people on the forum and unless you prove that you are asking for something that's not illegal, you won't get any response.