Hi there, Im running into quite a few snags and I'm not sure what to do

I work with another designer/engineer who edits parts within assemblys, does all the holes using linear patterns etc, which saves a lot of time for him. However whenever I recieve his pack n go's files seem to be missing, or things dangle, or break, or move and are not lined up properly. Why is this? Sometimes I save 2 zip files, and label one as "back up" incase one shifts around on me, so then I pull the parts or measurements i've taken out and use the back up (which I then make a new fresh copy called "new back up" or "new-er-er backup". How can I avoid these problems when I recieve pack and go's? quite a few questions in there, I will leave it at that.,

Thanks!
Jordan.