The responses you have gotten are really good. If you go the store to buy bolts, try to duplicate what belongs on you're particular model. Also buy a nut that fits the bolt, thread it onto the bolts before tapering the end of the bolt. Then when you're finished with the tapering, taking off the nut will straighten out the first couple of threads "ensuring" that it will thread into the hub without any problems.
The bolts on my 155d have both a sequense as well as a torque spec. I don't know what your spec's are, but I bet someone out here does and could fill in that info for you.
P.S. My manual also states that the Hub and Lugnuts are supposed to be checked for tightness. Lugnuts at 10hr / daily intervals. In real life it doesn't happen, at least it sould be done at the 100hr service's.
It's the little things that if left undone, or too many this will do for now repairs that will cause your equipment to let you down. The fact that you noticed the missing bolts shows that you are in the top 10 percent! Lloyd