You can see Your report history after about ~300 reports, you will get a list with the status of each report.
Why are people posting that it is 300 reports that the good/bad/unhandled reports indicator will be activated? I guess that is how it was in the past? According to Xal0lex which is a moderator on this forum, he posted that only 25 reported posts are enough for people to start seeing the good/bad/unhandled reports indicator.
You're not talking about the same thing:
25 good reports : you see your stats on reports (good/bad/unhandled)
300 good reports : you see the history of your reports.