His horse is named friday.
Well that's the boring correct answer, but since I know the riddle's already been solved, I'll throw in a different one just because :P
He actually was hiding out for two days, as the law was catching up to him. They saw him coming in this direction and were hot on his trail. Seeing him go through this town, they logically assumed he'd stay in the inn to hide out, so they checked, finding nothing. After two days, the law enforcement left to keep searching, while Matt stayed at the inn starting on monday and tuesday, robbed the bank on wednesday, and left on friday.
I know the horse is named Friday, but that's boring :P
As for xerox...
if it's not silence, I have no idea