Coming from a 944 and knowing the critical sticker being on the rear panel, then reading about the 986 critical sticker under the front boot/bonnet when looking at my approved 987S in April I found there was no sticker, suspecting the worst i took it up with salesman but on looking at several other Boxsters in the showroom none had a sticker under the front boot/bonnet. If my bonnet had been repaired/replaced in the 6 months prior to my ownership they did a fantastic job as all the bonnet stay bolts still have untouched paint on them and the paintwork appears original and boy have I looked.
I say don't worry unless there is obvious evidence of repair damage.
I did have a thought about the way the front edge of the bonnet/boot lid sits slightly below the mating face of the bumper but I walked around umpteen 987s at the recent Tipec show and most were exactly the same and came to the conclusion it was probably due to the manufacturing tolerances of the plastic bumper (again no evidence of bumper being repaired/replaced).
Cheers
Paul