Hey, i am glad i mentioned the legal traceability of controlled drugs as they are your Dad's, i understand your desperation, i really do, i have had access over the years to everything from Methadone to Fentanyl, given to me by well meaning friends to help with the pain they know i live with, and it's flipping hard to decide to then potentially turn around & use them for other things knowing the person will always blame themselves & then have legal & medical issues that will greatly affect how they live their lives. The upshot of that is either be very, very sneaky or find another way.
My bad, i was looking at my box with the assumption of it being 56 tablets per box. From what you first posted & now knowing the pack size the fact that you got 'pretty fucked up' on 100mgs, if you took the whole 500mgs, from a suicide point of view would in its self be pointless, if you took them for recreational purposes 500mgs would just be a waste of good drugs.