If you joined a faction this cycle, don’t forget to battle (and win!) at least 10 times during the next couple of days to be eligible for a boon. If you battled less than 10 times until the results are calculated, you won’t gain anything even if your faction wins.

You can check how often and which enemies you have fought on this screen: https://www.neopets.com/prehistoric/battleground/ …but you need to be logged in. ;)