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Humans and Sloths in SA
Don't know if they used Sloth Slayers per se 
This discovery was in the news recently. This article lets you see the bones and butchering marks.
"Megafaunal extinction in the late Pleistocene is a topic of great academic interest that also arouses ethical issues, due to the proposed impact of humans as its possible cause. Evidences on human-megafauna interaction are scarce, especially in South America, where this issue is entangled with the debate on the date of human arrival. Here we present the results of two radiocarbon datings of material found in a site in the Arroyo Vizcaíno, Uruguay. One of them was a rib and the other a clavicle, both belonging to an extinct giant mammal, the Pleistocene ground sloth Lestodon. The clavicle shows human-made marks. The analyses yielded consistent results, between 28 and 29 kybp, a much older age than predicted by the present paradigm of peopling of the Americas and from currently accepted datings, which cluster at about 12 kybp."
This discovery was in the news recently. This article lets you see the bones and butchering marks.
"Megafaunal extinction in the late Pleistocene is a topic of great academic interest that also arouses ethical issues, due to the proposed impact of humans as its possible cause. Evidences on human-megafauna interaction are scarce, especially in South America, where this issue is entangled with the debate on the date of human arrival. Here we present the results of two radiocarbon datings of material found in a site in the Arroyo Vizcaíno, Uruguay. One of them was a rib and the other a clavicle, both belonging to an extinct giant mammal, the Pleistocene ground sloth Lestodon. The clavicle shows human-made marks. The analyses yielded consistent results, between 28 and 29 kybp, a much older age than predicted by the present paradigm of peopling of the Americas and from currently accepted datings, which cluster at about 12 kybp."
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