If you are 100% sure that the chocolate packet touched a part of the floor that definitely became najjs, and that the chocolate packet had moisture on it, then yes it would be najis. This would easy to purify as you could merely put the packet under a tap or just remove the chocolates. If however the floor was dry and so was the packet, then it isn't najis.
Yes, we are allowed to touch any part of our body even if it is impure, but if our hand or the impure part was wet, then our hand becomes impure also and needs to be washed with water to be pure again before performing Prayers.
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