Were they sent as text messages? Did you download them to the phone?
You need to move the ringtone files to the ringtones folder or the notifications folder for the phone to recognize it as a tone for that type of notification or ringtone.
I'm most definitely NOT a VZW employee. If a post answered your question, please mark it as the answer.
So I have a similar problem. I've loaded the mp3 file to the ringtones folder in the root level. Also to the media>audio>ringtones folder. I've verified they are there. So, how do I get my Droid Razr to recognize that the file is there? It doesn't show up on my phone's ringtones list in settings. I've done a complete shutdown thinking that maybe it will force the phone to re-scan everything, but no joy.