So, I have had the Bear Vault 400 for about 6 years now. I was one of the lucky individuals who got one of the test lids with the double bumps around 2006. When I used it, (to test the lid), I didn't have any problems with bears on those trips. I let the company know that nothing had occurred.... I never thought much about it afterward, but thanks for letting me know that the same bear has also figured out the new lids in the HP region.