I remember snooping and finding my gifts one year. It really took the fun out of it and I never did it again. I remember one present was a bathrobe, not exactly a fun gift anyway.
I know exactly how you feel. My little brother and I were the worst at this. I remember this one year my mom tried to hide our presents out in our trailer/RV but we snuck in through a storage compartment that can be accessed from the outside. We popped the lock and crawled in, to find Star Wars action figures and random Pokemon stuff...it totally sucked the fun out of Christmas. No one in my family trusts me anymore, even though I refuse to ever peek again