I didn't drill the holes. I got it that way. A school system in south Florida did that to prevent theft. Instead of using a Kensington lock.
I guess they felt is was more secure.
Yeah undo the screw and walk away with it!!! Not that secure IMO. The recycler I got the iMac from says they are all like that.
But he said he will keep an eye out for one in better shape but will still have the holes.
I do see empty cases on eBay for 40-60 dollars. I could just see myself gutting the system and then trying to remember where everything went to but in newer case! My memory is not what it used to be.
BTW it is a Mid 2010 iMac Core i3