Impellar removal quesition

[nitrous]

Hey guys I have a quick impellar question.
I picked up my first Moomba last year a new 07 LSV and had it winterized at a local marine shop here since we do not have a Moomba dealer.
Anyways they winterized it and asked if I wanted the impellar pulled and I said ok.
They phoned me back and said that it was okay and they would just put in back in.
Now my question is can it be put back in wrong ? is there a certain way it should go in ?
This shop is mainly a outboard repair shop and don't think they have much experience with these types of engines which is concerning me.
I will fire it up in my driveway soon with my flush kit and as long as water is coming from exhaust and temp's are fine is it good to assume they put it back correct ?
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jailbroken