Well your warranty is voided if you break something in there while its opened. There really aren't many other indicators. The screws do have the paint on them that shows if they've been used heavily. However, I don't know how heavily that weighs in.
roger roger, but there is a method to my madness....
1) i am considering reapplying thermal paste to my 1g mba
2) i am considering switch the hdd for a 160 gb intel x18-m ssd when they debut.
thanks all!