Fortunately these are not very expensive as I remember. Since the engine wasn't run it is debatable if the bolts need to be replaced. The safe bet is to replace them.
Is it possible that any mysterious liquid got spilt onto the bearing? There are some things that eat the Bronze material a bearing is made from. Anti-Freeze comes to mind but I don't know how this or anything else got to the bearing?
Very strange indeed.
Never memorize something you can look up.