I would take out the toothbrush, use the space for pain meds. I would leave the lifesavers, or switch them to glucose tabs. Bigger zip ties. like Y_T said a better light source.

Since this is for employees I wonder if it would be a good idea to put instructions on the case, i.e. list and what its for, so they can look at it from the outside?

Have specific notice that to return to you for restocking, they are an awesome idea but not if they are not fully equipped.

Have you looked at this from a liability angle? This seems like a great idea, but in today's sue-happy world it's worth a mention.