We where playing a game of android this afternoon, and couldnt agree about whether you discard purgery and suprise witnesses at the end of the game, if they are the highest or lowest values in the apropriate files?

I felt that as they had no physical value they wouldnt, my opponent disagreed and thought that as the suprise witness are worth -5 that they are worth -5, and if there was no suprise witness a purgery is worth 0 and if there was a suprise witness its worth +10.

Thanks in advance.

You don't discard the surprise witness and perjury tokens. You only discard the tokens of the highest numerical value.