It seems a bit...low. ::grins::
I'd recommend making the trap difficulty based on the critter the box is from and then have the exp gain from disabling the trap based on the trap difficulty.
So some 23rd level Thief would get little(or no) experience from opening a goblin box...but might get a bit from dark ogre mages, a bit more from mummies and maximum experience from giants.(Just an example...)
Base trap difficulty(from easiest to hardest):
Gnome trap
Exploder
Soul Stealer/Shadow
Poison Dart
That's just how I feel it should be...the only trap I ever really consider difficult are those #$%@ Poison Dart traps that I love so much. ::grins::
-DeathTouched Glim Faethyn...23rd Thief
PS: Might post a more coherent example after I've had some coffee.