@Velas That's actually a great question. I don't remember anything from this exhibit from my previous visit. But i don't remenber seeing the sloths either.
However this time i didn't saw the sloths in here neither, so they were probably somewhere else.
On your porcupine picture (which actually is a Paraguayan hairy dwarf porcupine, sorry for being the correction guy), I managed to spot a light yellow ammount of fur inside one of the elevated huts, which I believe it is their sloth (the colour matches with the species shown on their website).
But if it isn't the case, I hope that they're not dead, because you know how the zoo is making zero efforts to bring back species...
@Velas You mean the fur in the box? that's actually another porcupine, i remember it being spiky and have the eyes by the side, the sloth was nowhere to be seen and was neither mentioned on the signs (though the signs also said it was a Brazilian procupine so...).
Though i would say the sloths are still around, i already mentioned to you but i cound't see two whole sections of the zoo, which included a big chunk of the local fauna, so i would guess they are still somewhere else.