The good thing to come out of it is that you have 5 new shiny coasters that you can use around your house.
There is no PS2 boot CD, full stop. The ones on kazza etc are fakes.
The only method to play backups without a mod is to jam a knife in the tray area, also known as the knife trick. You will do more damage by doing this than installing a mod chip. Its not going to stop working just because it has been opened, it's more likely to stop working by using the knife trick.