The first three are common to all consoles, and I have easily found them by googling "3ds key scrambler constant" and finding a google docs result...
The movable.sed is console specific (this is what prevents you from using other people's encrypted saves) and located in ctrnand
By the way, you probably don't have the old saves (unless you have an older backup of the SD) - the whole point of the titles folder is to hold currently installed titles and their saves, so they were removed while reinstalling