Putting a code on mailers for tracking?

[Michael Lerch]

Has anyone thought or tried putting a code on their mailers to make it easier to track when someone calls? 

I hate it when a seller calls and leaves a message that sounds like "This is John Jidfheeemdfuhfsdhf calling about my property at 213 biiigeshoopf dr. my number is blah blah blah." Where as with a mailer code I could have in my message "leave your name number, and postcard code to get an offer on your house... call you back soon... blah blah something sounding professional." That way I hear "John Smith 555-555-5555 and my code is A23, Thanks!" I can look up it up in my mailing list to match the name and property much easier so I can call back going in warm instead of cold. 

I can see that this may not get a great response rate because it comes across as gimmicky. This post may be more of a vent about people that can't leave clear messages haha, but has anyone tried this? What was your response rate vs. no code on the letter/postcard?  

[Adrien C.]

I understand your frustration. I don't think that will help for the exact reasons you mentioned. They'll be several who call and don't have the letter in front of them as well. I just call back all numbers even the ones who leave mumble jumble on the vm.