Welcome to the site. I don't know a code for you, but I had a Monoprice HDMI switch that had IR learning. That let me just program any code randomly into the remote and followed the directions in the manual for the switch to program the code.
That said, the monoprice site didn't mention IR learning for the one you bought. You can try emailing monoprice support to see if they know the basic code it uses, like if it matches a certain brand of tv or vcr or something.