What type of PS3????

May be...

my dad bought my brother a PS3 about half a year ago and he left the box at my dads house. how do i find out what type of PS3 we have like 40gb 60gb or 80???? is it somewhere on the PS3??

in the settings tab somewhere you should be able to find it i believe. since it was only half a year ago, it can only be 40 or 80. does it have 2 usb slots or 4? if 2, its the 40. if 4, its the 80.

Go on system information or something on the system settengs option on the settings bar on the menu and it should show you how much memory you have on the PS3

Go to Settings-System settings-System information.

There is shown how much space is left of the memory your PS3 has.