You would do better starting with this page, since it has references that you can check. Hard to check references in a video.
Also, I watched the first video, and it seems to be based on the so-called “Michigan relics,” that have been exposed as fraudulent twice. No Mormon scholars take that seriously, although there are a few Mormon weirdos who cling to them like pit bulls. (I’m a Mormon, by the way.)
DISCLAIMER: Catholic Answers has turned over the archive to Catholic-Questions.org and no longer owns, manages, or moderates the forums. For additional apologetics resources please visit www.catholic.com.