All I can say is ... Wow... tirade and rant warning...
Do yellow letters work? Yes
Do they annoy people? Yes
Do other letters work? Yes
Do they annoy people? YES
Can people be unreasonable? Yes
OK, so real estate investing is hard and it can suck because people... well that about sums it up - people... they are fickle and they do not like the idea of anyone knowing that they have what they have or did what they did, even if it is a matter of public record... as for the address of that couple, use their phone number from your caller ID to look them up... if that doesn't work, send them another letter... someone once said something about the fortune being in the follow-up... if they call back and are even more angry, explain that unless they identify themselves they cannot be removed from a list of addresses... as for your "angry cop" - get his/her badge number and precinct... then call the precinct and ask to speak with him/her ... when there is no such officer (as is likely) you can rest assured that people... if there is such an officer, request an in-person meeting at the precinct with both the officer and his/her supervisor (bring your information about your company, your processes and everything...) You will find that police are pretty nice people most of the time and when confronted with evidence and facts... they are usually pretty much just people...
All said, doi whatever works for you. I read once that there is nothing that is true until it is true for you (can't recall who that is from, I still like it). This means that YOUR truth is true because you experienced it, it may not be true for someone else... ie. what color is a rose? when I said rose, people thought of a rose - some pictured one, others imagined one some may have smelled one in their memory... what color was it? Most likely you thought of a white one right? NO??? you thought of the Green one??? Wait a minute, hold on... you aren't one of THOSE people... the ones who think roses are "red" are you?? See, truth is personal for many things... yes I know 2+2=4, always and that means that there is such a thing as universal empirical truth, however, most of our human arguments about "truth" are not empirical ones they are philosophical...
So what color are your letters? I personally like orange and pink... because yellow and white are so overdone...
~James