Re: engine number
First off, I think the oil quantity is listed at 10 qts. for the diesel, so you may want to check your owner's manual to verify. If they only put in 9.5, that would explain why the oil is a little on the low side!
As to the dipstick, what they say is sort of true and sort of not true...the dipstick is there for a reason.
Filling to the factory suggested level should get you into the middle of the acceptable range. Once the recommended amount has been put in, the dipstick is used to ensure it is at an adequate level. Many shops will not bother taking the extra time to top it up to the 'full' mark, as they do not want to risk over-filling and having to pull the plug to drain the extra out - it costs them time and money.
If you are between the hash marks indicating the oil is in the safe range, then you are fine. If it really bothers you, you can top it up yourself (just add a little at a time giving at least 20 minutes for the oil to settle, until you are accustomed to the dipstick markings).