Board Thread:Wiki Discussion/@comment-31960778-20170721040405/@comment-33959789-20171214023758

Well I do think that Sans is one of the characters referred to at the end of entry 17, Alphys wouldn't be, as she would still be one of those who hung out at the dump, and Papyrus is too much of a NUMBSKULL (pun definitely intended). So, I'd say that the other is most likely just a random lab assistant.