I have an MX-850, so you could email a file with learned signals for the MX-850 and I could transmit from the MX-850 to my captureIR system and see what the signals are.
My "database" is just a large collection of downloaded CCF files. That's really good for finding a code set given a decoded signal (even if brand and model don't match). But for finding a device by brand/model, if you can't find it in the online collections I use (mainly the CCF collection at RC) then I can't either.
I also use
[Link: lirc.sourceforge.net]and
[Link: hifi-remote.com]I wouldn't be any better than you at finding something in those two places by brand and model. But if you did find it there I probably know better how to translate it for an MX-850.