Loose spokes in new wheel 20"

[Old timer]

A friend of mine was let down by someone who wanted him to buy a cheap folding electric bike for them with his discount code. anyway he offered it to me at a real good price to get back his money. It was still boxed and had not been out of the box or even opened the box so I know it came that way from China.
I put the bike together (10 mins) charged up the battery and everything seems fine except for a run out on the back wheel. I inspected the wheel and there are a couple of loose spokes(really quite loose). I`ve ordered a multi fit spoke key from SJS and read a couple of articles with regards to wheel truing. I`m hoping when I get down to it I`m gonna find that the wobble is right where the loose spokes are(fingers crossed) It`s obvious that this bike was packed and never looked at so it can`t be road damage.
From what I gather marking the loose spokes with tape or something is a good idea so that you can go backwards.

I want to try to do this without taking the electric hub wheel out and just spin it in the frame. It`s about the only thing I haven`t tackled on a bike so want to try it.

Any extra little tips or tricks that might prevent me from cocking it up or make it easy??

Thanks

 

[mickle]

This> http://www.cyclorama.net/viewArticle.php?id=153

 

[arallsopp]

This> http://www.cyclorama.net/viewArticle.php?id=153

Hmmm....

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Pity, as my SMGTe has taken to developing loose spokes on the little 20 up front. I'm tightening them near arbitrarily at the moment, which seems to work but has given me an odd twitch in the bars for each revolution...

 

[mickle]

Servers up the spout then. Again. Keep trying, it'll be fixed.

 

[arallsopp]

Yep. All good now. That's a good tip re chalk too. Gonna give that a go.

...in the morning

 

[Old timer]

Thanks, just waiting for my spoke key